[рони]

Flector,
отмените всплытие клика

jQuery(".sp-head").on('click', function(event){
 *!*      
 event.preventDefault();
*/!*
        $this = jQuery(this);
        if($this.hasClass("unfolded")) {
            $this.removeClass("unfolded");
            $this.next().slideUp("fast");
            $this.next().addClass("folded");
            $this.prop('title', title.unfolded);
        } else {
            $this.addClass("unfolded");
            $this.next().slideDown("fast");
            $this.next().removeClass("folded");
        $this.prop('title', title.folded);
        }
    });