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Use pageX and pageY in Netscape navigator 4, and clientX and clientY in Internet Explorer 4+:
<script language="JavaScript"><!--
function coords(e) {
if (document.layers) {
alert(e.pageX + ',' + e.pageY);
}
else if (window.event) {
alert(window.event.clientX + ',' + window.event.clientY);
}
}
//--></script>
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<form>
<input type="button" value="Click me!" onClick="coords(event)">
</form>
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