hovering a linked image.

I am in the process of designing my new site. One annoyance I have never figured out a way around is when the mouse hovers an image that is a link. For instance, I am using the green color as my hover color. That color appears to the right of an image when hovered. On my current site, the hover color was the same as the background, so it wasn't that big a deal. I tried creating a new CSS class called "ImageLink" with a transparent background color, but that doesn't seem to help. Any suggestions?
: <A HREF="http://www.galleytech.com/about_us.html" TARGET=_blank>Check out this page</A>

The CSS file is located <A HREF="http://www.galleytech.com/style.css" TARGET=_blank>here</A>

Thanks.