timerID = null;
var active = 0;
var speed = 5;

function ChangePage(num){
  if(document.getElementById){
      obj[active].style.visibility = "hidden";
      active = num;
      obj[active].style.top = 00;
      obj[active].style.visibility = "visible";
  }
}

function listup(){
   if(document.getElementById){
      if(parseInt(obj[active].style.top) < 0)
          obj[active].style.top = parseInt(obj[active].style.top) + speed + "px";
      timerID = setTimeout("listup()",30);
   }
   $('#sup img').attr('src', 'public/images/ad_page/up_o.png');
}

function listdown(){
   if(document.getElementById){
      if(parseInt(obj[active].style.top) > document.getElementById('layer_marken').offsetHeight - obj[active].offsetHeight)
        obj[active].style.top = parseInt(obj[active].style.top) - speed + "px";
      timerID = setTimeout("listdown()",30);
    }
   $('#sdown img').attr('src', 'public/images/ad_page/down_o.png');
}

function stopthis(){
    if(document.getElementById){
       clearTimeout(timerID);
    }
   $('#sdown img').attr('src', 'public/images/ad_page/down.png');
}
function stopthisup(){
    if(document.getElementById){
       clearTimeout(timerID);
    }
   $('#sup img').attr('src', 'public/images/ad_page/up.png');
}

function initzierescrollbar() {
    if(document.getElementById){
       obj = document.getElementById("layer_marken").getElementsByTagName("ul");
       obj['marken'].style.visibility = "visible";
       obj['marken'].style.top = 0;
    }
    if(document.addEventListener){
       for(i=0;i<document.getElementsByTagName('a').length;i++)
           document.getElementsByTagName('a')[i].style.position = "relative";
    }
}