Hello Niels:
Looked at your info that you gave us. This is not a true pop-up window because you have a button that opens the page.
I have written a simple script for you.
place this info in the heading tags
<script language="JavaScript">
<!--
function MM_popupMsg(msg) { //v1.0
alert(msg);
}
function MM_openBrWindow(theURL,winName,features) { //v2.0
window.open(theURL,winName,features);
}
//-->
</script>
Place is this information in your body tag
<body bgcolor="#FFFFFF" onLoad="MM_openBrWindow('popup_info.html','','toolbar=yes,location=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes,width=400,height=500')" text="#000000" link="#0000FF" vlink="#0000FF" alink="#FF9933">
<table width="655" cellspacing="3" align="left">
Note
'popup_info.html' is your link
If you want to have the button open the link then assign the button to the link:
some thing like this.
http://lahabracyclery.comhope this helps
-damon