Why is this small Javascript not working ?

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Below you will find the first lines of my HTML page.
Why doesn't popup a dialog window ?
I click the Html page which is on my hard disc. A IE 5.5 browser window opens
but not a dialog window inside.

<TITLE>Test page</TITLE>
<script LANGUAGE="JavaScript">
function popitup(percent){
  popup = window.open("","popDialog","height=160,width=300,scrollbars=no");
//  -->
<BODY onLoad="popitup(0)">


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