Multiple menu items highlighted

This question was also asked on stackoverflow. Here’s a copy of the answer i gave there:

Perhaps you could style it using the nth-of-type CSS3 selector.

.current-menu-item:nth-of-type(1) {
    background:#ffff00;
    /* Highlight styles */
}

These styles would target only the first occurrence of the .current-menu-item. Likewise, you could choose to target the second with nth-of-type(2), et cetera.