Image Properties and Links

I have some images on my site that I have made into links to navigate my site.
I would really like that image to indicate somehow to the user that its a link. For example when they mouse over it glows or something.

I really dont want to get into roll over with different images, more something simple and I dont know how to script.

I noticed under advanced settings, advanced link settings there is Link Rel, Css class and styles. is there something I can put into that field to get the effect mentioned? any assistance would be most appreciated.