<html>
<head>
<title>Äîïîëíèòåëüíîå îêíî</title>
<script language="JavaScript">
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function winop()
{
windop = window.open("demo.htm","mywin","height=120,width=200,left=100,top=30");
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<body>
<a href="javascript:winop();">Îòêðûòü îêíî</a>
</body>
</html>