var speed = 0, currentpos = curpos1 = 0, alt = 1, curpos2=-1;

  function initialize(){
    if (window.parent.scroll01speed != 0){
      speed = window.parent.scroll01speed;
      scrollwindow();
      }
  }

  function scrollwindow(){
    temp = (document.all) ? document.documentElement.scrollTop : window.pageYOffset;
    alt = (alt == 0)? 1 : 0;
    if (alt == 0)
      curpos1 = temp;
    else
      curpos2 = temp;
    window.scrollBy(0,speed);
  }

  setInterval("initialize()",10);