var selected;
var checked =  new Boolean();

function ChangeLinks(a) 
{
	document.getElementById('header')
	document.getElementById('search')
	document.getElementById('cat_nav')
	document.getElementById('log_bar')
	
	link	=	document.getElementById(a);

	if (link==selected) 
	{
		link.className="off";
		selected = null;
		checked = false;
		switch (link.id) 
		{
        	case "search": 
			document.getElementById('search').className="off";
			break;
			case "cat_nav": 
			document.getElementById('cat_nav').className="off";
			break;
			case "log_bar": 
			document.getElementById('log_bar').className="off";
			break;
		}
	}
	else
	{
		link.className="on";
		selected = link;
		checked = true;
		
		switch (link.id) 
		{
        	case "search":
			document.getElementById('search').className="on";
			document.getElementById('cat_nav').className="off";
			document.getElementById('log_bar').className="off";
			break;
			case "cat_nav": 
			document.getElementById('cat_nav').className="on";
			document.getElementById('search').className="off";
			document.getElementById('log_bar').className="off";
			break;
			case "log_bar": 
			document.getElementById('log_bar').className="on";
			document.getElementById('cat_nav').className="off";
			document.getElementById('search').className="off";
			break;
		}
	}
}