defaultStep=2  
    step=defaultStep  

    function scrollDivDown(id)
    { 
        clearTimeout(timerDown)  
        document.getElementById(id).scrollTop+=step  
        timerDown=setTimeout("scrollDivDown('"+id+"')",10) 
    }  

    function scrollDivUp(id)
    { 
        clearTimeout(timerUp) 
        document.getElementById(id).scrollTop-=step  
        timerUp=setTimeout("scrollDivUp('"+id+"')",10) 
    }  

    timerDown=""  
    timerUp=""  

    function stopMe()
    { 
        clearTimeout(timerDown)  
        clearTimeout(timerUp) 
    } 

    document.onmousemove=function(){stopMe()}