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

return false; 
} 

function clickdown(e)
{
if (document.all)
{
  if (event.button==2)
  {
  }
}
if (document.layers)
{
 if (e.which == 3)
 {
  alert(varning);
  return false;
 }
}
}

document.oncontextmenu=nomenu; 
document.onmousedown=clickdown;