function showLogin()
{
	hideElement(document.getElementById('footer_links'));
	showElement(document.getElementById('login_prompt'));
}

function hideLogin()
{
	showElement(document.getElementById('footer_links'));
	hideElement(document.getElementById('login_prompt'));
}

function DownloadRedisplay()
{
	hideShowCovered('visible');
}

function DownloadResource(title,href,h,w)
{
	hideShowCovered('hidden');
	return GB_showCenter(title, href,h,w);
}

function MarkNavLinks(parentContainer,markClass,unMarkClass,this_page)
{	
	var arr = parentContainer.getElementsByTagName('a');
	var el;
	for(var i=0; i<arr.length; i++)
	{
		el = arr[i];	
		var a = el.pathname;
	
		/*var a = el.attributes.getNamedItem('href'); */
	   	if(a)
	   	{
	   		if((a==this_page) || ('/'+a==this_page))
	   		{
				setClass(el,markClass);
	   		}
	   		else
			{
				setClass(el,unMarkClass);
			}
	   	}
	}
}

GB_hide=function(cb){
GB_CURRENT.hide(cb);
DownloadRedisplay();
};