Dropdown Background Dissappears

LINK-
http://www.securehostserver.info/gkent/services/

The page linked above has a dropdown list under the main navigation buttons near the top. But, for some reason, the background color on the dropdown list under the “Services” button is transparent. Can someone figure out why and how to fix it?

Todd

This rule, having more a specific selector, takes precedence over the rules governing the other dropdowns.

#services #nav li.services a { 
    background: url(../i/gfx_rollover.jpg) no-repeat -267px 43px;
    color: #91E2F5;
    }

If you want the Services dropdown menu to appear the same as the others, remove this rule.

Firebug is very useful for troubleshooting this kind of problem.