The base path to the jquery-ui CSS used for display of the auto-complete drop down.

Note that westwind.css also includes some additional formatting for the autocomplete-ui tag:

.ui-autocomplete 
{
   max-height: 250px;
   overflow-y: auto;
   overflow-x: hidden;
   padding-right: 20px;
   width: 500px;
   font-size: 1pt;
   -moz-box-shadow: 3px 3px 5px #535353;
    -webkit-box-shadow: 3px 3px 5px #535353;       
    -box-shadow: 3px 3px 5px #535353;
}