Setting up graphical tabs using wp_list_pages

I’m trying to use wp_list_pages to display my graphical menu tabs (each tab is unique in design) for my main navigation.

The problem I am having is getting the tab for the current page to display correctly. In my CSS, i am styling the tab using the current_page_item class WP gives you like so:

#nav .page-item-4.current_page_item a {
	background-position: -116px -142px;
	width: 206px;
}

This works great in all browsers, but unfortunately this dies in IE6 due to the multiple classes. Any idea of another approach while still using wp_list_pages? I’d prefer not to have a hard coded menu or any crazy ie6 css hacks, so I’m hoping I’m overlooking the obvious.

thanks