function slideSwitch() {
    var active = jQuery('#partners div.active');

    if ( jQuery(active).length == 0 ) active = jQuery('#partners div:last');

    var next =  jQuery(active).next().length ? jQuery(active).next()
        : jQuery('#partners div:first');

    jQuery(active).addClass('last-active');

    jQuery(next).css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            jQuery(active).removeClass('active last-active');
        });
}

jQuery(function() {
    setInterval( "slideSwitch()", 5000 );
});