Zet dit in je HEAD
-------------------------

<SCRIPT>
function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=0,width=505,height=600,left = 326,top = 182');");
}
</script>
-------------------------
Zet dit in je BODY

 	
<a href="javascript:popUp('u.....link.htm')">
de link naam ........</a>