You can't just put "img src=filename.jpg" when uploading to the web, because some servers have specific conventions for how files are called, so that goes into the mix. So, if your webhost/server has those requirements, your images won't load. The best way to test it, is to load a simple html file with mouseover actions on it, load your images, and then load the html page and try it.
(For example, on my server, I have to use ../images/filename.jpg for OnMouseOver events, which means my code would look like <img src="../images/filename.jpg"> minus the greater than/less than brackets).
If you've already been loading images to a webpage, then it wouldn't be any different than what you've normally been doing, just make sure the images are uploaded to the server.

It's easy to forget, sometimes.
(DO NOT INSTALL ANY PYTHON VERSION OVER 2.6 - IT WILL DEPRECATE YOUR PLUG-INS AND RENDER THEM USELESS)
Python tutorial and installation links can be found here:
http://photocomix-resources.deviantart. ... r-74889017or here:
http://www.gimpusers.com/tutorials/inst ... ndows.html
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"In order to attain the impossible, one must attempt the absurd."
~ Miguel de Cervantes