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  use strict;
  print "Enter your monitor's resolution?\n";
  chomp ($_ = <>);
  $_ = /^\s*(\d+)\s*x\s*(\d+)\s*/i or die;
  print "The resolution is $1 x $2\n";

  <script language="JavaScript">
    var width = window.screen.availWidth
    var height = window.screen.availHeight
    alert(width + "*" + height)
  </script>

   screen.width
   screen.height
   screen.availWidth
   screen.availHeight
   document.body.clientWidth
   document.body.clientHeight