/***This one does the instant popdowns***/
            
        function showhide_pref(which)
        {
        	off = which + '_off';
        	on  = which + '_on';
        
			if (document.getElementById(off).style.display == "block")
			{
				document.getElementById(off).style.display = "none";
				document.getElementById(on).style.display = "block";				
        	}
        	else
        	{
				document.getElementById(off).style.display = "block";
				document.getElementById(on).style.display = "none";
        	}
        }
    
	
		var chunk	= new Array(1);
		chunk[0]  = "search";
		chunk[1]  = "search2";
		chunk[2]  = "login";

		
		var state = 'closed';
		
		function showhide_chunk()
		{
			for (i = 0 ; i < chunk.length; i++ )
			{								
				off = chunk[i] + '_off';
				on  = chunk[i] + '_on';
				
				if (state == 'closed' && document.getElementById(off).style.display)
				{
					document.getElementById(off).style.display = "block";
					document.getElementById(on).style.display = "none";	
				}
				else
				{
					document.getElementById(off).style.display = "none";
					document.getElementById(on).style.display = "block";
				}
			}
			
			if (state == 'closed')
				state = 'open';
			else
				state = 'closed';
		}

//	Grab the list items in the main navigation list and run hide or show functions as appropriate.
function drop_down() 
{
	//	Make sure browser is capable to doing the things we need.
	if(!document.getElementsByTagName) return false;
	if(!document.getElementById) return false;
	
	//	Do the class changes as appropriate.
	var list_items = document.getElementById("main_navigation").getElementsByTagName("li");
	var i = 0;
	while (i < list_items.length) 
	{
		list_items[i].onmouseover=function() 
		{
			this.className+=" drop_down";
		}
		list_items[i].onmouseout=function() 
		{
			this.className=this.className.replace(new RegExp(" drop_down\\b"), ""); 
		}
		
		i++;
	}
}

window.onload = drop_down;