function popup(args,larg,alt){
	var x ='';
	var y ='';
	var tmp='';

	x = screen.width/2 - (larg/2) ;
	y = screen.height/2 - (alt/2) ;
	tmp= "scrollbars=no, resizable=no, width=" + larg + ",height=" + alt + ",top=" + y + ",left=" + x;
	window.open(args,'',tmp);
}