function popup(ppurl,ppname,ppx,ppy,ppscroll)
{	
	var ppleft = (screen.width - ppx - 10) / 2;
	var pptop = (screen.height - ppy - 80) / 2;
	window.open(ppurl,ppname,'width='+ppx+',height='+ppy+',scrollbars='+ppscroll+',resizable=0,menubar=0,toolbar=0,status=1,location=0,directories=0,left='+ppleft+',top='+pptop+'');
}