no need to yell 'help' as this is a help forum and nearly everyone would like to get some help ;-)
it can work with css:
use the pseudo class :hover
and css sprites, i.e. background images that shift position in the :hover style.
(search for online tutorials with the bold keywords)
example:
.menu-tab a:link {
background-image: url(images/tab-link.jpg);
background-position: 0px 0px; /* background left top */
}
.menu-tab a:hover {
background-image: url(images/tab-link.jpg);
background-position: 0px 30px; /* background left 30px shifted */
}
tab-link.jpg is an image with the width of your tab, and twice the height (60px in this example),
top half is the way tou tab looks normally, lower half is how it looks with mouseover.