Handle = 0;
Speed = 0;

function SCRL(){
   window.parent.New.scrollBy(0, Speed);
}

function START(Param){
   Speed = Param;
   if (Handle == 0){
      Handle = setInterval("SCRL()",100);
   }
}

function STOP(){
   Speed = 0;
   if (Handle != 0){
      clearInterval(Handle);
      Handle = 0;
   }
}