var spawn = null;

function openWin(url,w,h) { 
var address = url;
	var usrw = w;
	var usrh = h;
	
if (spawn == null)
{
	spawn = window.open(address, "popup", "toolbar=yes,status=yes,resizable=yes,scrollbars=yes,width=" + usrw + ",height=" + usrh + ",left=400,top=40"); 
 }
 
 else
 { 
 	if(spawn.closed)
	{
		 spawn = window.open(address, "popup", "toolbar=yes,status=yes,resizable=yes,scrollbars=yes,width=" + usrw + ",height=" + usrh + ",left=400,top=40"); 
	}
	else
	{
 	spawn.location.href=url;
	spawn.focus();
	}
 }
}