[Lock15]

This may help out those also learning .css. You may want to first correct the styles in your .css. The beginning is missing on two of the styles, an added comma was inserted (remove the comma), a class name is missing, and change the closing style for the two that had the opening missing.

/* header tabs */
.tabs {
position: absolute;
top: 7px;
right: 6px;
margin: 0px;
padding: 0px;
height: 25px;
width: 80%;
text-align: right;
}
.tabs ul {
margin: 0px;
padding: 0px;
list-style: none;
}
.tabs li {
float: right;
margin: 0px 1px 0px 0px;
padding: 0px;
background: transparent url("images/tab_right_roll.png") no-repeat right top;
height: 25px;
overflow: hidden;
}
.tabs a:link, {
.tabs a:visited,
.tabs a:hover,
.tabs a:active
}
Class Name missing {
display: block;
background: transparent url("images/tab_left_roll.png") no-repeat left top;
margin: 0px 5px 0px 0px;
padding: 5px 10px 5px 15px;
text-align: center;
vertical-align: middle;
white-space: nowrap;
color: #253161;
text-decoration: none;
font-weight: bold;
font-size: 11px;
height: 25px;
outline-style: none;
}
.tabs a:hover {
color: #2863c2;
background-position: 0 -25px;
}