[Zope] Setting an image type

We have access to images stored on someone else's server. We are able to get to them from a path provided as a field in a database. I prepend the path with the static server address and use the result as an <IMG SRC=> tag. Works great in IE ... not at all in any Netscape except 6. The files are named with number references and no extension. IE can 'see' what the content type is but I guess NS cannot. Is there anyway to tell Netscape that this IMG SRC really is a JPG file and to go ahead and display it? Can I add something to the header though Zope or the DTML-VAR when I display the image? May not be a Zope issue but I figured there may be something Zope can do to the page as it loads. Thanks Allen