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event.screenX

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<html>
<head>
<script type="text/javascript">
function show_coords(event)
  {
  x=event.screenX
  y=event.screenY
  alert("X coords: " + x + ", Y coords: " + y)
  }
</script>
</head>
<body onmousedown="show_coords(event)">

<p>Click in the document. An alert box will alert 
the x and y coordinates of the cursor.</p>

</body>
</html>

TIY

screenX
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