Tabpanel Example 2: Multiselect

<div role="application">
  
  <script type="text/javascript">

    var tabpanel1 = new TabPanelMultiselect("tabpanel_1");
    widgets.add(tabpanel1);

    var tab1 = new Tab("tab_1", "panel_1");
    tabpanel1.add(tab1);

    var tab2  = new Tab("tab_2", "panel_2");
    tabpanel1.add(tab2);

    var tab3 = new Tab("tab_3", "panel_3");
    tabpanel1.add(tab3);

    var tab4 = new Tab("tab_4", "panel_4");
    tabpanel1.add(tab4);
    
  </script>

  
  <h2>Happy Time Pizza On-line Ordering System</h2>

  <form>
  
    <dl class="tablist" role="tablist" aria-multiselect="true" id="tabpanel_1" class="tabpanel">

      <dt id="tab_1" role="tab" tabindex="0" aria-expanded="false">Crust Options</dt>

      <dd id="panel_1" role="tabpanel" aria-labelledby="tab_1" aria-hidden="true">
        
        <ul class="controlList">
          <li><label><input type="radio" name="crust" value="crust1"/>Deep Dish</label></li>
          <li><label><input type="radio" name="crust" value="crust1"/>Thick and cheesey</label></li>
          <li><label><input type="radio" name="crust" value="crust1"/>Thick and spicey</label></li>
          <li><label><input type="radio" name="crust" value="crust1"/>Classic thin</label></li>
          <li><label><input type="radio" name="crust" value="crust1"/>Foot stamped (New)</label></li>
        </ul>
        
      </dd>
      
      <dt id="tab_2" role="tab" tabindex="0" aria-expanded="true">Vege Options</dt>
      
      <dd id="panel_2" role="tabpanel" aria-labelledby="tab_2"  aria-hidden="false">
        
        <ul class="controlList">
          <li><label><input type="checkbox" name="vege1"/>Black Olives</label></li>
          <li><label><input type="checkbox" name="vege2"/>Green Olives</label></li>
          <li><label><input type="checkbox" name="vege3"/>Green Peppers</label></li>
          <li><label><input type="checkbox" name="vege4"/>Mushrooms</label></li>
          <li><label><input type="checkbox" name="vege5"/>Black Olives</label></li>
          <li><label><input type="checkbox" name="vege6"/>Onions</label></li>
          <li><label><input type="checkbox" name="vege7"/>Pineapple</label></li>
        </ul>
        
        <dt id="tab_3" role="tab" tabindex="0" aria-expanded="false">Carnivore Options</dt>
        <dd id="panel_3" role="tabpanel" aria-labelledby="tab_3" aria-hidden="true">
          
          <ul class="controlList">
            <li><label><input type="checkbox" name="meat1"/>Hamburger</label></li>
            <li><label><input type="checkbox" name="meat2"/>Ham</label></li>
            <li><label><input type="checkbox" name="meat3"/>Itailian Sausage</label></li>
            <li><label><input type="checkbox" name="meat4"/>Pepporroni</label></li>
          </ul>
          
        </dd>
        
        <dt id="tab_4" role="tab" tabindex="0" aria-expanded="false">Delivery Options</dt>
        <dd id="panel_4" role="tabpanel" aria-labelledby="tab_4" aria-hidden="true">

          <ul class="controlList">
            <li><label><input type="radio" name="delivery" value="delivery1"/>Eat in</label></li>
            <li><label><input type="radio" name="delivery" value="delivery2"/>Carry out</label></li>
            <li><label><input type="radio" name="delivery" value="delivery3"/>Delivery</label></li>
            <li><label><input type="radio" name="delivery" value="delivery4"/>Overnight mail</label></li>
          </ul>
          
        </dd>
        
     </dl>
  
  </form>
</div>

  <script type="text/javascript">
/**
*
* The Globale Variables
*/

if (!window.Node) {
  var Node = {            // If there is no Node object, define one
    ELEMENT_NODE: 1,    // with the following properties and values.
    ATTRIBUTE_NODE: 2,  // Note that these are HTML node types only.
    TEXT_NODE: 3,       // For XML-specific nodes, you need to add
    COMMENT_NODE: 8,    // other constants here.
    DOCUMENT_NODE: 9,
    DOCUMENT_FRAGMENT_NODE: 11
  }
}


var KEY_PAGEUP   = 33;
var KEY_PAGEDOWN = 34;
var KEY_END      = 35;
var KEY_HOME     = 36;

var KEY_LEFT     = 37;
var KEY_UP       = 38;
var KEY_RIGHT    = 39;
var KEY_DOWN     = 40;

var KEY_SPACE    = 32;
var KEY_TAB      = 9;

var KEY_BACKSPACE = 8;
var KEY_DELETE    = 46;
var KEY_ENTER     = 13;
var KEY_INSERT    = 45;
var KEY_ESCAPE    = 27;

var KEY_F1        = 112;
var KEY_F2        = 113;
var KEY_F3        = 114;
var KEY_F4        = 115;
var KEY_F5        = 116;
var KEY_F6        = 117;
var KEY_F7        = 118;
var KEY_F8        = 119;
var KEY_F9        = 120;
var KEY_F10       = 121;

var KEY_M         = 77;

var NS_XHTML = "http://www.w3.org/1999/xhtml"
var NS_STATE = "http://www.w3.org/2005/07/aaa";

// **********************************************
// *
// * Commonly used helper functions
// *
// **********************************************

/**
*
* nextSiblingElement
*
* @contructor
*/

function nextSiblingElement( node ) {

  var next_node = node.nextSibling;

  while( next_node
    && (next_node.nodeType != Node.ELEMENT_NODE) ) {
    next_node = next_node.nextSibling;
  }  // endwhile

  return next_node;
  
}

/**
*
* previousSiblingElement
*
* @param ( node ) node object for which you are looking for the next sibling element node
*
* @return ( node) next sibling or "null"
*/

function previousSiblingElement( node ) {

  var next_node = node.previousSibling;

  while( next_node
    && (next_node.nodeType != Node.ELEMENT_NODE) ) {
    next_node = next_node.previousSibling;
  }  // endwhile

  return next_node;
  
}

/**
*
* firstChildElement
*
* @param ( node ) node object for which you are looking for the first child element node
*
* @return ( node) next sibling or "null"
*/

function firstChildElement( node ) {

  var next_node = node.firstChild;

  while( next_node
    && (next_node.nodeType != Node.ELEMENT_NODE) ) {
    next_node = next_node.nextSibling;
  }  // endwhile


  return next_node;
  
}

/**
*
* getTextContentOfNode
*
* @contructor
*/

function getTextContentOfNode( node ) {

  var next_node = node.firstChild;
  var str = "";

  while( next_node ) {
    
    if( (next_node.nodeType == Node.TEXT_NODE ) &&
      (next_node.length > 0 )
     )
      str += next_node.data;
    
    
    next_node = next_node.nextSibling;
    
  }  // endwhile

  return str;
  
}

/**
*
* setTextContentOfNode
*
* @contructor
*/

function setTextContentOfNode( node, text ) {

   // Generate a new text node with the text value
    var text_node = document.createTextNode(text);
  
    // Remove child nodes to remove text
    while (node.firstChild) {
      node.removeChild(node.firstChild);
    } // while

    // Append new text to the container element
    node.appendChild( text_node );

}
  </script>

  <script type="text/javascript">
// JavaScript Document
// Widgets is a way to initialize widgets in the ARIA examples


function Widgets() {
  this.widgets = new Array();
}

/**
* add is member of the Widgets Object
* and used add a widget ot the list of widgets to be intitialized
* as part of the onload event
* The controls array is the list of controls to initialize
* @member Enable
* @return none
*/

Widgets.prototype.add = function(obj) {
  this.widgets[this.widgets.length] = obj;
}

/**
* init is member of the Widgets Object
* and is called by the onload event to initialize widgets in the web resource
* The controls array is the list of controls to initialize
* @member Enable
* @return none
*/

Widgets.prototype.init = function() {
     
   for(var i = 0; i < this.widgets.length; i++ )
     this.widgets[i].init();
}

var widgets = new Widgets();

function initApp() {
  widgets.init();
}

  </script>

  <script type="text/javascript">
// JavaScript Document
// This module is to abstract browser dependencies
// This makes the widget code cleaner and earier to read by making most browser specfic coding
// in one place rather han scatered throghot documents
var ARIA_STATE = "aria-";

//
// WebBrowser object to abstract accessibility API differences between web standards supporting browsers and Internet Explorer 7.0
//
// The state variable keeps track of current state of checkbox
function WebBrowser() {

}


//
// keyCode is a function to get the keycode from a keypress event
//
// @param ( event object) event is an event object
//
// @return ( keycode )

WebBrowser.prototype.keyCode = function( event ) {
  var e = event || window.event;
  
  return e.keyCode;
}  

/**
* OnClick Event Simulator
*
* @param ( node ) DOM node object
* @return nothing
*/

if( document.createEvent ) {

  // If a web standards based browser implement this function

  WebBrowser.prototype.simulateOnClickEvent = function( node ) {
    // W3C DOM Events way to trigger a "click" event
    var e = document.createEvent('MouseEvents');
    e.initEvent( 'click', true, true );

    node.dispatchEvent( e );

  }

} else {

  // If a Microsoft IE based browser implement this function
  
  WebBrowser.prototype.simulateOnClickEvent = function( node ) {

    var e = document.createEventObject();
    node.fireEvent( "onclick", e );

  } // endif

}

if ( document.addEventListener ) {

  // If a web standards based browser implement this function

  WebBrowser.prototype.setMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

    if( clickHandler )
      document.addEventListener( "click",     clickHandler, true );
    
    if( downHandler )
      document.addEventListener( "mousedown", downHandler,  true );

    if( moveHandler )
      document.addEventListener( "mousemove", moveHandler,  true );
    
    if( upHandler)
      document.addEventListener( "mouseup",   upHandler,    true );

  }

  WebBrowser.prototype.releaseMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

  if( upHandler)
      document.removeEventListener( "mouseup",   upHandler,    true );
      
    if( moveHandler )
      document.removeEventListener( "mousemove", moveHandler,  true );
    
    if( downHandler )
      document.removeEventListener( "mousedown", downHandler,  true );
      
    if( clickHandler )
      document.removeEventListener( "click",     clickHandler, true );

  }

} else {

  // If a Microsoft IE based browser implement this function

  WebBrowser.prototype.setMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

   node.setCapture();
   if( clickHandler)
     node.attachEvent( "onclick", clickHandler );
    
   if( downHandler)
     node.attachEvent( "onmousedown", downHandler );
    
   if( moveHandler )
     node.attachEvent( "onmousemove", moveHandler );
    
   if( upHandler )
     node.attachEvent( "onmouseup", upHandler );

  } // endif

  WebBrowser.prototype.releaseMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

   if( upHandler )
     node.detachEvent( "onmouseup", upHandler );
    
   if( moveHandler )
     node.detachEvent( "onmousemove", moveHandler );
    
   if( downHandler)
     node.detachEvent( "onmousedown", downHandler );
    
   if( clickHandler)
     node.detachEvent( "onclick", clickHandler );
    
     node.releaseCapture();

  } // endif


}




if (typeof document.documentElement.setAttributeNS != 'undefined') {

  WebBrowser.prototype.stopPropagation = function( event ) {
    if( event.stopPropagation )
      event.stopPropagation();
    if( event.preventDefault )
      event.preventDefault();
    return false;
  }

  WebBrowser.prototype.target = function( event ) {
  return event.target;
  }
  
  WebBrowser.prototype.attrName = function( event ) {
  return event.attrName;
  }

  WebBrowser.prototype.testAttrName = function( event , attrName) {
  return event.attrName == attrName;
  }

  WebBrowser.prototype.charCode = function(event) {
     return event.charCode;
  }

  WebBrowser.prototype.calculateOffsetLeft = function( node ) {
  return node.offsetLeft;    
  }
  
  WebBrowser.prototype.calculateOffsetTop = function( node ) {
  return node.offsetTop;    
  }
  
  WebBrowser.prototype.pageX = function( e ) {
    return e.pageX;    
  }
  
  WebBrowser.prototype.pageY = function( e ) {
    return e.pageY;    
  }
  
  WebBrowser.prototype.setNodePosition = function(node,left,top) {
    node.style.left = left+"px";
    node.style.top = top+"px";
  }


} else {

  WebBrowser.prototype.stopPropagation = function( event ) {
    event.cancelBubble = true;
    event.returnValue = false;
    return false;
  }

  WebBrowser.prototype.charCode = function(event) {
    return window.browser.keyCode( event );
  }

  WebBrowser.prototype.target = function( event ) {
    return event.srcElement;
  }

  WebBrowser.prototype.attrName = function( event ) {
  return event.propertyName;
  }
    
  WebBrowser.prototype.testAttrName = function( event , attrName) {
        
        var str = attrName;
        
        if( attrName.indexOf("aria-") >=0 ) {
            str = attrName.replace(/aria-/,"");
            var node = document.getElementById('test1');
            if( node )
               node.innerHTML = str.substr(0,1).toUpperCase();
            var len  = str.length;
            str = "aria" + str.substr(0,1).toUpperCase() + str.substr(1, len);
            var node = document.getElementById('test2');
//            if( node )
//               node.innerHTML = node.innerHTML + "<li>" + str + "</li>";
        }
        
        return event.propertyName == str;
  }
    
  WebBrowser.prototype.calculateOffsetLeft = function(node) {
  var offset = 0;
  
  while( node ) {
    offset += node.offsetLeft;
    node = node.offsetParent;
  }
  
  return offset;    
  }
  
  WebBrowser.prototype.calculateOffsetTop = function(node) {
  var offset = 0;
  
  while( node ) {
    offset = offset + node.offsetTop;
    node = node.offsetParent;
  }
  
  return offset;    
  }
  
  WebBrowser.prototype.pageX = function( e ) {
    return e.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft);    
  }
  
  WebBrowser.prototype.pageY = function( e ) {
    return e.clientY + (document.documentElement.scrollTop || document.body.scrollTop);    
  }
  
  WebBrowser.prototype.setNodePosition = function(node,left,top) {
    offsetx = 0;
    offsety = 0;
    nnode = node.offsetParent
    while( nnode ) {
      offsetx = offsetx + nnode.offsetLeft;
      offsety = offsety + nnode.offsetTop;
      nnode = nnode.offsetParent;
    }
    node.style.left = left-offsetx+"px";
    node.style.top = top-offsety+"px";
  }
  
};


if (document.addEventListener) {

     // Functions for W3C Standards compliant implementation of adding event handlers

     WebBrowser.prototype.addEvent = function(elmTarget, sEventName, fCallback) {
       elmTarget.addEventListener(sEventName, fCallback, false);
       returnValue = true;
     };

     WebBrowser.prototype.removeEvent = function(elmTarget, sEventName, fCallback) {
       elmTarget.removeEventListener(sEventName, fCallback, false);
       returnValue = true;
     };

     WebBrowser.prototype.addChangeEvent =  function(elmTarget, fCallback) {
      elmTarget.addEventListener("DOMAttrModified", fCallback, false);
      returnValue = true;
    };

} else {

  if(document.attachEvent) {

     // IE Specific Event handler functions
     WebBrowser.prototype.addEvent = function(elmTarget, sEventName, fCallback) {
       returnValue = elmTarget.attachEvent('on' + sEventName, fCallback);
     };

     WebBrowser.prototype.removeEvent = function(elmTarget, sEventName, fCallback) {
       returnValue = elmTarget.detachEvent('on' + sEventName, fCallback);
     };

    WebBrowser.prototype.addChangeEvent =  function(elmTarget, fCallback) {
      returnValue = elmTarget.attachEvent("onpropertychange", fCallback);
    };

  } else {

     // For browsers that do not support W3C or IE event functions
     WebBrowser.prototype.addEvent = function(elmTarget, sEventName, fCallback) {
       return false;
     };

     WebBrowser.prototype.removeEvent = function(elmTarget, sEventName, fCallback) {
       return false;
     };

     WebBrowser.prototype.addChangeEvent =  function(elmTarget, fCallback) {
       return false;
     };

  }

}

var browser = new WebBrowser();

  </script>

  <script type="text/javascript">
// JavaScript Document


/**
*
* The TabPanelMultiselect object is used to maintain information about a Tab Panel widget
* including the collection of tab objects
*
* @contructor
*/


function TabPanelMultiselect( id ) {

  this.id = id;
  this.tabs = new Array();
  this.current_tab = 0;

}

/**
* init is a subclass of TabPanelMultiselect and is used to initialize the event handlers and
* tabs in a tab panel.
*
* @member TabPanelMultiselect
* @return nothing
*/

TabPanelMultiselect.prototype.init = function() {

  this.node = document.getElementById(this.id);

  var obj = this;

  browser.addEvent(this.node, "click",   function(event) {handleTabPanelMultiselectClickEvent(event, obj); }, false);
  browser.addEvent(this.node, "keydown", function(event) {handleTabPanelMultiselectKeyDownEvent(event, obj); }, true);

  for(var i = 0; i < this.tabs.length; i++ )
     this.tabs[i].init( this, i );

  this.tabs[0].node.tabIndex = 0;

}

/**
* add is a subclass of TabPanelMultiselect
* The tab obj is added to the list of tabs in a Tab Panel object
*
* @member TabPanelMultiselect
* @param ( Tab Object) obj
* @return nothing
*/

TabPanelMultiselect.prototype.add = function(obj) {
  this.tabs.push( obj );
}


/**
*
* The Tab object is used to maintain information about a panel in a Tab Panel widget
* including the node of the last control that had focus in the tab panel
*
* @params ( IDREF ) tab_id   the id of the tab control container element
* @params ( IDREF ) panel_id the id of the panel container element
* @contructor
*/

function Tab( tab_id, panel_id ) {

  this.tab_id = tab_id;
  this.panel_id = panel_id;

}

/**
* init is a subclass of Tab
* The init function currentlt doesn't do anything right now
*
* @member TabPanelMultiselect
* @return nothing
*/

Tab.prototype.init = function( tab_panel, num ) {

   this.tab_num = num;
   this.node = document.getElementById( this.tab_id );
   this.node_panel = document.getElementById( this.panel_id );

   this.node.tabIndex = -1;
  
   var obj1 = this;
   var obj2 = tab_panel;
  
   browser.addEvent(this.node, "focus",   function(event) {handleTabFocusEvent(event, obj1, obj2); }, false);
  
}

/**
* nextTabPanelMultiselect moves to the next tab panel
* Updates the current tab panel index
* If panel was selected before in current session focus is moved to last control with focus
* Used by keyboard event handlers to change currrent tab panel
*
* @param ( TabPanelMultiselect object) tab_panel is the TabPanelMultiselect object associated with the event
* @return nothing
*/

tabPanelMultiselectNext = function( tab_panel ) {

   if( tab_panel.current_tab < (tab_panel.tabs.length - 1) ) {

   tabPanelMultiselectMoveTo( tab_panel, (tab_panel.current_tab + 1) );

   } // endif

}


/**
* previousTabPanelMultiselect moves to the previous tab panel
* Updates the current tab panel index
* If panel was selected before in current session focus is moved to last control with focus
* Used by keyboard event handlers to change currrent tab panel
*
* @param ( TabPanelMultiselect object) tab_panel is the TabPanelMultiselect object associated with the event
* @return nothing
*/

tabPanelMultiselectPrevious = function( tab_panel ) {

   if( tab_panel.current_tab > 0 ) {
  
   tabPanelMultiselectMoveTo( tab_panel, (tab_panel.current_tab - 1) );
    
   } // endif

}


/**
* tabPanelMultiselectMoveTo moves to the previous tab panel
* Updates the current tab panel index
* Used by keyboard event handlers to change currrent tab panel
* If panel was selected before in current session focus is moved to last control with focus
*
* @param ( TabPanelMultiselect object) tab_panel is the TabPanelMultiselect object associated with the event
* @param ( TabPanelMultiselect object) index is the index in the panel list of the selected panel
* @return nothing
*/

function tabPanelMultiselectMoveTo( tab_panel, index ) {

  if( index < 0 )
     index = 0;
    
if( index >=   tab_panel.tabs.length )
    index = tab_panel.tabs.length - 1;

   if( (index >= 0 ) && ( index < tab_panel.tabs.length ) ) {
    
    for(var i=0; i < tab_panel.tabs.length; i++ ) {
    
        tab_panel.tabs[i].node.tabIndex = -1;  
    
    } // end for
    
     // Move keyboad focus
     tab_panel.tabs[index].node.tabIndex = 0;;
     tab_panel.tabs[index].node.focus();

   } // endif

}

/**
* tabPanelMultiselectToogleExpanded
*
* @param ( DOM node )
* @return nothing
*/

function tabPanelMultiselectToggleExpanded( tab_panel ) {

   var current_tab = tab_panel.tabs[tab_panel.current_tab];

   if( current_tab.node.getAttribute("aria-expanded") == "true") {

        current_tab.node.setAttribute("aria-expanded", "false");
        current_tab.node_panel.setAttribute("aria-hidden", "true");
        
   } else {
  
        current_tab.node.setAttribute("aria-expanded", "true");
        current_tab.node_panel.setAttribute("aria-hidden", "false");    
        
   } // endif

   current_tab.node.className += "";
   current_tab.node_panel.className += "";
        
}

/**
* indexNodeInTabList checcks to see if the node the event ocurred on is in the list of tab in the tab panel
*
* @param ( DOM node ) node_target of the element the event occured on
* @param ( TabPanel object) tab_panel is the TabPanel object associated with the event
* @return index of tab panel of current event target; -1 if node target is not in list
*/

function indexOfNodeInTabList ( node_target, tab_panel ) {

  var index = -1;
  
  for(var i = 0; i < tab_panel.tabs.length; i++ ) {

     if( node_target == tab_panel.tabs[i].node ) {
      index = i;
    }  // endif

   }  // endfor

  return index;
  
}

/**
* isNodeInTabList checcks to see if the node the event ocurred on is in the list of tabs in the tab panel
*
* @param ( DOM node ) node_target of the element the event occured on
* @param ( TabPanel object) tab_panel is the TabPanel object associated with the event
* @return boolean true if the node is in the tab list, otherwise false
*/

function isNodeInTabList ( node_target, tab_panel ) {

  var flag = false;
  
  for(var i = 0; !flag &&  (i < tab_panel.tabs.length); i++ ) {
    
    if( node_target == tab_panel.tabs[i].node ) {
      flag = true;
    } //endif
    
  }  // endfor

//  alert(flag);
  return flag;
  
}

/**
* findTabForTabPanel
*
* @param ( DOM node ) node_target of the element the event occured on
* @param ( TabPanel object) tab_panel is the TabPanel object associated with the event
* @return boolean true if the node is in the tab list, otherwise false
*/

function getTabForTabPanel( node_target, tab_panel ) {

var index = null;

  // Find node with role=tabpanel

var node = node_target.parentNode;

while( node &&
             ( node.getAttribute('role') != "tabpanel")
            ) {
     node = node.parentNode;
}  // end while
  
//  alert( node.id );
  
  if( node ) {
  
    var tab_id = node.getAttribute("aria-labelledby");
    
    if( tab_id )
       node = document.getElementById( tab_id );
      
    index =  indexOfNodeInTabList ( node , tab_panel );  
  
  } // endif
  
  return index;
  
}



/**
* handleTabPanelMultiselectKeyDownEvent
* Keyboard commands for the Tab Panel
*
* @param ( event object ) event
* @param ( TabPanelMultiselect object) tab_panel is the TabPanelMultiselect object associated with the event
* @return boolean false if the event was used by Tab Panel, otherwisee true
*/

function handleTabPanelMultiselectKeyDownEvent(event, tab_panel) {
    var e = event || window.event;
    
    // Save information about a modifier key being pressed
    // May want to ignore keyboard events that include modifier keys
    var no_modifier_pressed_flag = !e.ctrlKey && !e.shiftKey && !e.altKey;
    var control_modifier_pressed_flag = e.ctrlKey && !e.shiftKey && !e.altKey;

    switch( e.keyCode ) {


        case KEY_UP:
             if( !isNodeInTabList( browser.target(e), tab_panel ) &&  control_modifier_pressed_flag ) {
          
                   var tab_index  = getTabForTabPanel(browser.target(e), tab_panel );
            
                  if( tab_index != null )
                      tabPanelMultiselectMoveTo( tab_panel, tab_index );
            
                   return browser.stopPropagation(e);
             }  // endif          

        case KEY_LEFT:
            if( isNodeInTabList( browser.target(e), tab_panel ) && no_modifier_pressed_flag ) {
                  tabPanelMultiselectPrevious( tab_panel);
                 return browser.stopPropagation(event);
               } // endif
              
           break;

        case KEY_RIGHT:
      case KEY_DOWN:
           if( isNodeInTabList( browser.target(e), tab_panel ) && no_modifier_pressed_flag  ) {
               tabPanelMultiselectNext( tab_panel);
               return browser.stopPropagation(e);
              } // endif
           break;

      case KEY_HOME:
         if( isNodeInTabList( browser.target(e), tab_panel ) && no_modifier_pressed_flag ) {
             tabPanelMultiselectMoveTo( tab_panel, 0 );
             return browser.stopPropagation(e);        
       }
       break;

      case KEY_END:
         if( isNodeInTabList( browser.target(e), tab_panel ) && no_modifier_pressed_flag ) {
             tabPanelMultiselectMoveTo( tab_panel, (tab_panel.tabs.length - 1)  );
             return browser.stopPropagation(e);        
       }      
       break;

      case KEY_SPACE:
      case KEY_ENTER:
           if( isNodeInTabList( browser.target(e), tab_panel ) && no_modifier_pressed_flag ) {          
              tabPanelMultiselectToggleExpanded( tab_panel );
              return browser.stopPropagation(e);
         }  // endif          
          break;
          
      case KEY_PAGEDOWN:
           if( control_modifier_pressed_flag ) {
             if( isNodeInTabList( browser.target(e), tab_panel ) ) {
            
               tabPanelMultiselectMoveTo( tab_panel, (tab_panel.current_tab+1) );

             } else {

               var tab_index = getTabForTabPanel( browser.target(e), tab_panel );
              
               if( tab_index != null )
                  tabPanelMultiselectMoveTo( tab_panel, (tab_index+1) );

             } // endif
              return browser.stopPropagation(e);
         }  // endif          
          break;

      case KEY_PAGEUP:
           if( control_modifier_pressed_flag ) {
             if( isNodeInTabList( browser.target(e), tab_panel ) ) {
               tabPanelMultiselectMoveTo( tab_panel, (tab_panel.current_tab-1) );

             } else {

               var tab_index = getTabForTabPanel( browser.target(e), tab_panel );
              
               if( tab_index != null )
                  tabPanelMultiselectMoveTo( tab_panel, tab_index );

             } // endif
              return browser.stopPropagation(e);
         }  // endif          
          break;


  }
  
  return true;
  
}


/**
* handleTabPanelMultiselectClickEvent
* handlers changing tab panels when the user uses the mouse to select a tab
*
* @param ( event object ) event
* @param ( TabPanelMultiselect object) tab_panel is the TabPanelMultiselect object associated with the event
* @return boolean false if the event was used by Tab Panel, otherwisee true
*/

handleTabPanelMultiselectClickEvent = function(event, tab_panel) {
   var e = event || window.event;
  
   var index = indexOfNodeInTabList( browser.target(e), tab_panel);

   if( index >= 0 ) {
  
   tabPanelMultiselectMoveTo( tab_panel, index );
     tabPanelMultiselectToggleExpanded( tab_panel );
         
     return browser.stopPropagation(e);

   } // endif

  return true;
  
}

/**
* handleTabFocusEvent
*
* @param ( event object ) event
* @param ( Tab object ) tab
* @param ( TabPanelMultiselect object) tab_panel is the TabPanelMultiselect object associated with the event
*
* @return boolean false if the event was used by Tab Panel, otherwisee true
*/

handleTabFocusEvent = function(event, tab, tab_panel) {
   var e = event || window.event;
  
  tab_panel.current_tab = tab.tab_num;
         
  return browser.stopPropagation(e);

  return true;
  
}

  </script>

  <style type="text/css">
/* CSS Document */

input:focus,
input:active {
  outline: 1px solid black;
}

dl.tablist {
  margin: 0;
  padding: 0;
  list-style: none;
  border-bottom: thin solid black;
  width: 20em;
}

dl.tablist dt {
  margin: 0;
  border-top: thin solid black;
  border-left: thin solid black;
  border-right: thin solid black;
  padding-left: 1.25em;
  padding-right: 1em;
  padding-top: .25em;
  padding-bottom: .125em;
  font-weight: bold;
  background-color: #0099CC;
  color: white;
  background-repeat:no-repeat;
  background-position: 3px center;
  background-image: url(images/contracted.gif);
}

dl.tablist dt:hover,
dl.tablist dt:active,
dl.tablist dt:focus {
  background-color: #006699;
  color: white;  
}

dl.tablist dt[aria-expanded="true"] {
  background-repeat:no-repeat;
  background-position: 3px center;
  background-image: url(images/expanded.gif);  
}

dl dd {
  margin: 0;
  padding: 0;
  padding-top: .25em;
  padding-bottom: .5em;
  padding-left: 1.25em;
  border-top: thin solid black;
  border-left: thin solid black;
  border-right: thin solid black;
}

dl.tablist dt[aria-expanded="false"] + dd {
  display: none;
}

dl.tablist dt[aria-expanded="true"] + dd {
  display: block;
}

dl.tablist dd ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
  </style>