Q907 How can I open a popup window - once only - when my frameset loads?

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The easiest thing to use is the Framesets onLoad event handler:

<html>
<head>
<script language="JavaScript"><!--
var windowHandler = null;

function openWindow() {
    windowHandler = window.open('http://www.irt.org','windowName','width=640,height=480');
}
//--></script>
</head>

<frameset cols="50%,*" onLoad="openWindow()">
<frame src="pagea.htm">
<frame src="pageb.htm">
</frameset>

This way the window will be opened when the complete frameset loads first time. If the user navigates your site within the frames then the popup will not load again.