[adpboss]

<td width=85 height=30 class=Tab align=center>{$tab_title}</td>

You need to add link markup in the css for the "tab" class.

IE

.Tab {
        COLOR: #330000; TEXT-DECORATION: none;
}
.Tab:link {
        COLOR: #330000; TEXT-DECORATION: none;
}
.Tab:visited {
        COLOR: #330000; TEXT-DECORATION: none;
}
.Tab:hover {
        COLOR: #550000; TEXT-DECORATION: underline;
}
.Tab:active  {
        COLOR: #330000; TEXT-DECORATION: none;
}

Just add

.Tab:link {
        COLOR: #330000; TEXT-DECORATION: none;
}
.Tab:visited {
        COLOR: #330000; TEXT-DECORATION: none;
}
.Tab:hover {
        COLOR: #550000; TEXT-DECORATION: underline;
}
.Tab:active  {
        COLOR: #330000; TEXT-DECORATION: none;
}

below your .tab entry in the skin1.css.