function slideSwitch() {
    
    var $count = $("#slideshow" + " a").size(); 
    var $activar = Math.floor(Math.random()*$count);
    
    var $next = jQuery("#slideshow" + " a").eq($activar);
    var $active = $('#slideshow a.active');
    
    $next.addClass('active');
    $active.removeClass('active');
}