// set up
window.onload=function()
{
	tab.setup = {
		tabs: document.getElementById( "topics-tab-title" ).getElementsByTagName( "li" ),
		pages: document.getElementById( "topics-tab" ).getElementsByTagName( "dl" )
	}
	
	tab.init();
}

var tab = {
	init: function()
	{
		var tabs = this.setup.tabs;
		var pages = this.setup.pages;
		
		for ( i = 0; i < pages.length; i++ )
		{
			if ( i !== 0 ) pages[i].style.display = 'none';
			else
			{
				pages[i].style.display = "block";
				tabs[i].className = "selected";
			}
			tabs[i].onclick = function()
			{
				tab.showpage( this );
				return false;
			};
		}
	},
	
	showpage: function( obj )
	{
		var tabs = this.setup.tabs;
		var pages = this.setup.pages;
		var num;
		
		for ( num = 0; num < tabs.length; num++ )
		{
			if ( tabs[ num ] === obj ) break;
		}
		
		for ( var i = 0; i < pages.length; i++ )
		{
			if ( i == num )
			{
				pages[ num ].style.display = 'block';
				tabs[ num ].className = 'selected';
			}
			else
			{
				pages[i].style.display = 'none';
				tabs[i].className = null;
			}
		}
	}
}