Simple template modification. Make your links more funny.

Open Admin CP >>> Style Manager >>> choose a style and go to the Main CSS.

In the Additional CSS Definitions, paste that code at the begin of it.

a:hover{
text-decoration: none;
color: #6699cc;
background: url(hoverlinks.gif);
background-position: bottom bottom;
}

Upload the file hoverlinks.gif I attached to your forum root. Then see the effect of it.