var mvit = function() {
 var divs=$$("#anim div");
 var imgs=$$("#anim div img");
 var dv=divs[0];

 var lft=parseInt(dv.getStyle("margin-left"));
 
 if(lft <= (-140 - 290*(imgs.length-3))) {
  lft=-140;
  dv.setStyle("margin-left",lft+"px");
 }
 lft -= 290;

 var fx = new Fx.Morph(dv, { duration:1500, transition:Fx.Transitions.Cubic.easeInOut });
      fx.start({ "margin-left":lft });
}

window.addEvent("load", function(){
 if($('anim')) mvit.periodical(3500);
});