OK, your tdheader background color is #333366, which is very similar to your link colors, which are:
A:link {
color : #333366;
text-decoration : none;
background-color : transparent;
}
A:visited {
color : #000033;
text-decoration : none;
background-color : transparent;
}
A:active {
color : #000033;
text-decoration : none;
background-color : transparent;
}
A:hover {
color : #800000;
text-decoration : underline;
background-color : transparent;
}
You need to consider lightening up your tdheader background color or using something that contrasts well (not another blue), but still looks good with the rest of your site.
