defaultStep=4
step=defaultStep

function scrollDivDown(id){
clearTimeout(timerDown)
document.getElementById(id).scrollTop+=step
timerDown=setTimeout("scrollDivDown('"+id+"')",.5)

}

function scrollDivUp(id){
clearTimeout(timerUp)
document.getElementById(id).scrollTop-=step
timerUp=setTimeout("scrollDivUp('"+id+"')",.5)
}

timerDown=""
timerUp=""

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

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