My method for this involves using Javascript. Since Google does not allow Javascript to be inserted directly in a page you have to use a gadget. There are two methods shown here. Note that when your gadget links to a http: URL you will see am "unsafe content" warning in Google (https:) sites. You must click to allow it. Try linking to https URLs to avoid this.
(Modify the code in red for your site) <?xml version="1.0" encoding="UTF-8"?><Module>
<ModulePrefs title="popup" /><Content type="html"><![CDATA[<a href="javascript:void(0)"onclick="window.open('http://w8shi.net','miniwin',
'left=25,top=25,screenX=25,screenY=25,toolbar=0,location=0, directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width=700,height=600'); return false;"> W8SHI in a popup window.</a>]]></Content></Module>
The gadget URL is: http://hosting.gmodules.com/ig/gadgets/file/117770694006921265528/popup.xml Information about the window.open method
You can skip creating a Gadget by using the Embed Gadget:
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