function init()
{		
	var as, popfun;
	as=document.getElementsByTagName('a');
	for (var i=0; i<as.length; i++) {
		if(as[i].target && as[i].target=='popup') {
			
			var width = as[i].getAttribute('popwidth') ? as[i].getAttribute('popwidth') : 500;
			var height = as[i].getAttribute('popheight') ? as[i].getAttribute('popheight') : 350;
			var left = (screen.width - width) / 3;
			var top = (screen.height - height) / 3;
			var windowAttributes = 'width='+width+',height='+height+',left='+left+',top='+top+',scrollbars=yes,location=no,toolbar=no, resizable=yes';
			
			popfun=function(){
				var theWindow = window.open(this.href,this.target,windowAttributes);
				theWindow.focus();
				return false;
			}
			
			as[i].onclick=popfun;
		}
	}
}

addEvent(window, "load", init);