function popup(page,title,width,height) {
 var winl = (screen.width - width) / 2;
 var wint = (screen.height - height) / 2; 
 window.open(''+page,''+title,'width='+width+',height='+height+',top='+wint+',left='+winl+',resizable=no,scrollbars=no,toolbar=no'); 
}