Oh I know what you want. I have done this before, and you can make your page pop up via a JavaScript link. To impliment this, paste the following code in between the head tags of your site:

Code:
<SCRIPT LANGUAGE="JavaScript">
<!-- Idea by:  Nic Wolfe ([email protected]) -->
<!-- Web URL:  http://fineline.xs.mw -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=100,height=100,left = 350,top = 250');");
}
// End -->
</script>
Or have it link from an external .js script.

Then in the <body> tag insert

Code:
<BODY onLoad="javascript:popUp('filename')">
This code courtesy of Google. http://javascript.internet.com/gener...up-window.html

Please be aware this may not work with browsers that have pop up blockers. Hope this helps, if it does not, please PM me.