function showhidediv (di)
{
if (document.getElementById(di+'div').style.visibility != 'visible'){
		document.getElementById(di+'div').style.pixelTop = document.body.scrollTop;
		document.getElementById(di+'div').style.visibility = 'visible';
	}
else {
		document.getElementById(di+'div').style.visibility = 'hidden';
	}
}