v7 and earlier
The JavaScript Pop Up Window solution as described in the Advanced User Guide suggests using just the image file name for the Custom Property URL. The problem with this is that the browser will try to find the Pop Up image in the cgi-bin because the product page is served from the cgi-bin.
You can overcome the problem either by specifying the full URL for the image file in the Product Custom Property URL of by changing the included html file to specify the full URL e.g.
Note that the Pop-Up will no longer work in Preview mode.
The JavaScript Pop Up Window solution as described in the Advanced User Guide suggests using just the image file name for the Custom Property URL. The problem with this is that the browser will try to find the Pop Up image in the cgi-bin because the product page is served from the cgi-bin.
You can overcome the problem either by specifying the full URL for the image file in the Product Custom Property URL of by changing the included html file to specify the full URL e.g.
HTML Code:
<a href="javascript:popUp('http://server/acatalog/CUSTOMVAR:URL')">NETQUOTEVAR:PRODUCTIMAGE</a>