Full screen Javascript not working in windows 7

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Javascript

Dear all

I am developing online test in which i want display the page in full screen mode without showing taskbar. I used javascript for this, its perfectly working with windows XP but in windows 7 its not hide the taskbar. here is the javascript that i used

Kindly help me for this.

<script type="text/javascript">
<!--
          function popup(url) {
              params = 'width=' + screen.width;
              params += ', height=' + screen.height;
              params += ', top=0, left=0'
              params += ', fullscreen=yes';
              params += ', status=no';
              params += ', toolbar=no';

              newwin = window.open(url, 'windowname', params);
              if (window.focus) { newwin.focus() }
              return false;
          }
// -->
</script>

Full Screen mode