function element_show(tt){
		document.getElementById(tt).style.visibility='visible';
	}
	function element_hide(tt){
		document.getElementById(tt).style.visibility='hidden';
	}



// lightbox routines
function showLB(lb){
document.body.style.overflow='hidden';
document.getElementById('overlay').style.top=document.body.scrollTop;
document.getElementById('overlay').style.display='block';
var x= document.getElementById(lb);
	x.style.display='block';
	document.body.style.marginRight='0px'

}


function hideLB(lb){
document.body.style.overflow='auto';
document.getElementById('overlay').style.display='none';
var x= document.getElementById(lb);
	x.style.display='none';
	document.body.style.marginRight='15px'
	
}