a#aspectj-hello-world img { background-image : url(graphics/ajapp_obj.gif); }
a#aspectj-hello-world:hover img { background-image : url(graphics/ajapphov_obj.gif); }

a#ajdt-help-tutorial img { background-image : url(graphics/aj_tutorial.gif); }
a#ajdt-help-tutorial:hover img { background-image : url(graphics/aj_tutorialhov.gif); }