[Typo3-dev] Pop-up in FE... how to?

[Stig N. Jepsen]

I want to accomplish something like the Element Browser popup.
But instead it should be some sort of a phone/addressbook.

So i have some javascript like this:
function setFormValueOpenBrowser() { //
var url = "what should be the url here???";
browserWin =
window.open(url,"Typo3WinBrowser","height=350,width=600,status=0,menubar
=0,resizable=1,scrollbars=1");
browserWin.focus();
}
and then i have this piece of html:
<a href="#" onclick="javascript:setFormValueOpenBrowser();">Open Address
Book</a>

I don't know which way to go from here...
Is it possible to somehow open a popup displaying a custom templatefile
for the extension still maintaining the contact to class of the
extension. How should this be done?
Or is it possible to display only a specific content element in a popup?
Well that would still require a template around it, wouldn't it?

Thanks in advance!

/Stig