/**
 * Copyright (c) 2006, Opera Software ASA
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Opera Software ASA nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY OPERA SOFTWARE ASA AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL OPERA SOFTWARE ASA AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 *	Grabs all ordered and unordered lists with the id "multiPageHelp", and
 *	creates a tabbed based help system.
 */
function enableMultiPageHelps()
{
	//	grab all the OL and UL
	var	listsCollections = [ document.getElementsByTagName( 'ol' ), document.getElementsByTagName( 'ul' ) ];
	for( h=0,listsCollection; listsCollection=listsCollections[h]; h++ )
	{
		for( var i=0,currentList; currentList=listsCollection[i]; i++ )
		{
			if( (' '+currentList.className+' ').match( /\s+multiPageHelp\s+/g ) )
			{
				//	currentList is a multiPageHelp

				//	hook the changePage method
				currentList.changePage = function( childNodeIndex )
				{
					this.childNodes[ this.currentPage	].className = (' '+this.childNodes[ this.currentPage	].className+' ').replace( / selected /g, '' ).replace( /^\s*|\s*$/g, '' );
					this.childNodes[ childNodeIndex		].className += ' selected';
					this.currentPage = childNodeIndex;
				}

				//	browse the LI and hook the click handler
				var theLi = currentList.firstChild, childNodeIndex=0;
				while( theLi )
				{
					if( theLi.nodeName=='LI' )
					{
						if( currentList.currentPage===undefined )
						{
							//	select the first page/LI by default
							theLi.className			+= ' selected';
							currentList.currentPage	= childNodeIndex;
						}

						//	grab the tab/SPAN and attach the nodeIndex + hook the click event to it
						var theSpan = theLi.firstChild;
						while( theSpan && theSpan.nodeName!='SPAN' )
							theSpan = theSpan.nextSibling;
						if( theSpan )
						{
							theSpan.nodeIndex	= childNodeIndex;
							theSpan.onclick		= function(){ this.parentNode.parentNode.changePage( this.nodeIndex ); };
						}
					}
					//	off to the next LI
					theLi = theLi.nextSibling;
					childNodeIndex++;
				}
			}
		}
	}
}