$ul = document.getElementById('navigation').children[0].children;
    for(a=0,max=$ul.length;a<max;a++)
    {
        $ul[a].children[0].children[0].onmouseover = function() { if(this.src.indexOf('_act.')>-1) return; this.src = this.src.replace('.gif', '_act.gif').replace('.jpg', '_act.jpg'); this.act = true; }
        $ul[a].children[0].children[0].onmouseout = function(el) { if(!this.act) return; this.src = this.src.replace('_act.gif', '.gif').replace('_act.jpg', '.jpg'); }
    }