The simplest way to create a javascript popup is to create a function like so.

<script language="javascript" type="text/javascript">

<!--

// I have called the popup showPop

function showPop(url)

{

// This is the part that opend the new window, we set the url, name and dimensions of the window

newwindow = window.open(url,'name','height=400,width=550');

}

// -->

</script>

And then add the following to the anchor link you would like to popup.

<a href="#" onclick="return showPop('http://www.google.co.uk')"> see my popup </a>