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<html>
<body>
<script language="JavaScript">
function function1() {
var m = ""
m = "The left coordinate is: " + window.screenLeft + "\n";
m += "The top coordinate is: " + window.screenTop + "\n";
alert(m);
}
</script>
<body bottommargin="150">
<input type="button" value="Extract the coordinates" onclick="function1();">
</body>
</html>
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