defaultStep=3  
step=defaultStep  

function scrollDivDown(id){ 
clearTimeout(timerDown)  
document.getElementById(id).scrollTop+=step  
timerDown=setTimeout("scrollDivDown('"+id+"')",20) 

}  

function scrollDivUp(id){ 
clearTimeout(timerUp) 
document.getElementById(id).scrollTop-=step  
timerUp=setTimeout("scrollDivUp('"+id+"')",20) 
}  

timerDown=""  
timerUp=""  

function stopScroll(){ 
clearTimeout(timerDown) ; 
clearTimeout(timerUp) ;
} 

//document.onmouseout=function(){stopMe()}