JavaScript Moving Window

Moving Window

<script>
<!--
//
  var mx=2
  var my=2

function movewindow(){
  if (self.screenLeft + document.body.clientWidth > screen.width) mx=-5
  if (self.screenLeft < 0) mx=5
  if (self.screenTop + document.body.clientHeight> screen.Height - 20) my=-5
  if (self.screenTop < 0) my=5
  window.moveBy(mx, my)
  setTimeout("movewindow()",100)
//  movewindow()
}

-->
</script>
</HEAD>