function popup(file,w,h) { 
     var winl = (screen.width - w) / 2;
     var wint = (screen.height - h) / 2;
     winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',resizable=0,location=0,scrollbars=yes,status=1'
   window.open(file, "", winprops)
}