Make your markup look like this :
<div class="divTitleLink">
<a>Your First link</a>
<div class="divDescription">Your First Description</div>
</div>
<div class="divTitleLink">
<a>Your Second link</a>
<div class="divDescription">Your SecondDescription</div>
</div>
...
Then, in your javascript :
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('a').hover(
function () {
$(this).parent('div').find('.divDescription').show();
},
function () {
$(this).parent('div').find('.divDescription').hide();
}
);
});
If I guessed the markup wrong, then you can adjust it using the parent, find, children and siblings functions in jQuery.