/** This is high-level function; REPLACE IT WITH YOUR CODE.
 * It must react to delta being more/less than zero.
 
function handle(zabava) {
	if (zabava < 0) {
		movedown();
		clearTimeout(movedownvar);
		}
	else {
		moveup();
		clearTimeout(moveupvar);
		}
}

function wheel(event){
	var zabava = 0;
	if (!event) event = window.event;
	if (event.wheelDelta) {
		zabava = event.wheelDelta/120; 
		if (window.opera) zabava = -zabava;
	} else if (event.detail) {
		zabava = -event.detail/3;
	}
	if (zabava)
		handle(zabava);
        if (event.preventDefault)
                event.preventDefault();
        event.returnValue = false;
}

/* Initialization code. 
if (window.addEventListener)
	window.addEventListener('DOMMouseScroll', wheel, false);
window.onmousewheel = document.onmousewheel = wheel;

*/


function hookEvent(element, eventName, callback)
{
  if(typeof(element) == "string")
    element = document.getElementById(element);
  if(element == null)
    return;
  if(element.addEventListener)
  {
    if(eventName == 'mousewheel')
      element.addEventListener('DOMMouseScroll', callback, false);  
    element.addEventListener(eventName, callback, false);
  }
  else if(element.attachEvent)
    element.attachEvent("on" + eventName, callback);
}

function unhookEvent(element, eventName, callback)
{
  if(typeof(element) == "string")
    element = document.getElementById(element);
  if(element == null)
    return;
  if(element.removeEventListener)
  {
    if(eventName == 'mousewheel')
      element.removeEventListener('DOMMouseScroll', callback, false);  
    element.removeEventListener(eventName, callback, false);
  }
  else if(element.detachEvent)
    element.detachEvent("on" + eventName, callback);
}





function cancelEvent(e)
{
  e = e ? e : window.event;
  if(e.stopPropagation)
    e.stopPropagation();
  if(e.preventDefault)
    e.preventDefault();
  e.cancelBubble = true;
  e.cancel = true;
  e.returnValue = false;
  return false;
}


function MouseWheel(e)
{
  e = e ? e : window.event;
  var wheelData = e.detail ? e.detail * -1 : e.wheelDelta / 40;

  //do something

  return cancelEvent(e);
}