var m = 0;//Scrollable element marginTop
   var e = null;//Scrollable element
   var d = null;//Debugger
   var c = 1;
   var tim = null;

   function scrollUp(){
    doScrollUp();
    return false;
   }

   function scrollDown(){
    doScrollDown();
    return false;
   }

   function doScrollUp(){
    e.style.marginTop = c-parseInt(m) +"px";
	c--;
    tim = setTimeout("doScrollUp()", 10);
   }

   function doScrollDown(){
    e.style.marginTop = c+parseInt(m) +"px";
    if(c < 0)
    c++;
    tim = setTimeout("doScrollDown()", 10);
   }

   function stopScroll(){
    if(tim)
     clearTimeout(tim);
   }

   window.onload = function(){
    e = document.getElementById("content_inner");
    d = document.getElementById("debug");
    m = e.style.marginTop;
   }