When your writing or editting a message just click on the image button to add some tags to your post. If your web site supports remote file linking, all you need to do is add the URL of the file in between the tags. Too easy...
But, not all web hosts support remote linking. The thing to do there is to make a small html file that displays the image, post the link here in the forum, and use the http:// button to make it an active link that anyone can easily click on. This technique works for Geocities, Lycos, Freeservers, Angelfire, and a slew of other free web sites that prohibit remote file linking.
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TAZ
Example:
http://www.geocities.com/tzircher/doga_guns.htm