if (window.Event)
  document.captureEvents(Event.MOUSEUP);

function nocontextmenu() {
  event.cancelBubble = true, event.returnValue = false;

  return false;
} 

function norightclick(e) {
  if (window.Event) {
    if (e.which == 2 || e.which == 3) return false;
  }
  else if (event.button == 2 || event.button == 3) {
    event.cancelBubble = true, event.returnValue = false;
    return false;
  }
}

if (document.layers)
  document.captureEvents(Event.MOUSEDOWN);

document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;
document.onmouseup = norightclick;

function disableselect(e){
return false
} 
  
function reEnable(){
return true
} 
  
//if IE4+
document.onselectstart=new Function ("return false") 
  
//if NS6
if (window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable
}