/* Give every 10n + 1 a specific color */
jQuery(document).ready(function() {
    jQuery('li.collapsing.pages li.collapsing.pages.item').addClass(function(index) {
        artist_index = index;
        if (artist_index > 9) {
            artist_index %= 10;
        }
        return 'artist-nr-' + (artist_index + 1);
    });
});