Pop-ups are created in JavaScript using a simple open() method of the window property like so:
<script type='text/javascript'>
var x = window.open('your_popup_page.html','x','width=100, height=100,top=100,left=100');
</script>
The width, height, top and left properties are customizable for your popup, as well as various other properties that can be found in a JavaScript or DHTML documentation.
If you want to have actual ads for an advertiser, you need to contact one of them to get the code they use.
HTH!
-Snib
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