function popview(url){
	var w = 850;
	var h = 850;
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
var win = window.open(url,'preview','location=yes,menubars=yes,scrollbars=yes,resizable=yes,width='+w+',height='+h+',top='+wint+',left='+winl+'');
win.window.focus();
}