function div_aan(imgobj) {
			document.getElementById('imagePopup').src = imgobj.src;
			var w = imgobj.width;
			var h = imgobj.height;
			var winl = (document.body.clientWidth-w)/2;
			var wint = (document.body.clientHeight-h)/2;
			if (winl < 0) winl = 0;
			if (wint < 0) wint = 0;
			if (window.pageYOffset)
			{
				gescrolld = window.pageYOffset;
			}
			else if (document.documentElement && document.documentElement.scrollTop)
			{
				gescrolld = document.documentElement.scrollTop;
			}
			else if (document.body)
			{
				gescrolld = document.body.scrollTop;
			}
			document.getElementById('popupdiv').style.left=winl+'px';
			document.getElementById('popupdiv').style.top=wint+gescrolld+'px';
			document.getElementById('popupdiv').style.display='block';
		}

		function div_uit() {
			document.getElementById('popupdiv').style.display='none';
			document.getElementById('imagePopup').src = '/extras/spacer.gif';
		}