in the menu.css file, try changing the height of the UL to 67px; instead of 68px;
ul#cssmw {
background-image: url(../cssmw_images/bluenavbar.jpg);
background-repeat: no-repeat;
cursor: default;
height: 67px;
list-style-type: none;
margin: 0 0 0 0;
padding: 0 0 0 0;
}