Thanks Lisa,
I'm not so sure about this one; for there to be a current state, I would expect to see a rule for it in your menu.css stylesheet. Whether it is set or not depends on the javascript block that appears immediately below the menu on your page.
You could try adding:
#cssmw li.current a, #cssmw li.current a:link, #cssmw li.current a:visited, #cssmw li.current a:active {
background-color:#CC1776;
color: #FFFFFF;
}
to the end of your webassist/plugins/main_menu/menu.css file. The javascript bit on your page looks set to accomodate the current state already, so I don't think it needs to be changed.