window.onload = function() {
    var scroll = document.getElementsByClassName("scroll");
    for(i=0;i<scroll.length;i++){
      Event.observe(scroll[i], "click", function(event){
        var target = Event.element(event).id.replace("for_","");
        new Effect.ScrollTo(target);
        Event.stop(event);
      }, false);
    }
    
    var fortop = document.getElementsByClassName("fortop");
    for(i=0;i<fortop.length;i++){
      Event.observe(fortop[i], "click", function(event){
        new Effect.ScrollTo("header");
        Event.stop(event);
      }, false);
    }
    
  }