timerID = null;
        
function ScrollUp(speed) {
 if(document.getElementById) {
  if(parseInt(txt.style.top) < 0) {
   txt.style.top = parseInt(txt.style.top) + speed + "px";
  }
  timerID = setTimeout("ScrollUp("+speed+")",30)
 }
}

function ScrollDown(speed) {
 if(document.getElementById) {                        
  if(parseInt(txt.style.top) > cnt.offsetHeight - txt.offsetHeight) { 
   txt.style.top = parseInt(txt.style.top) - speed + "px";
  }
  timerID = setTimeout("ScrollDown("+speed+")",30)
 }
}

function ScrollStop() {
 if(document.getElementById) {
 clearTimeout(timerID);
 }
}

function ScrollInit() {
 if (document.getElementById) {
  cnt = document.getElementById("scrollconteneur");
  txt = document.getElementById("scrolltexte");
  txt.style.top = 0;
 }
}