//Try simple disable of right-click
function clickIE4(){
  if (event.button==2)
    return false;
}

function clickNS4(e){
  if (document.layers||document.getElementById&&!document.all) {
    if (e.which==2||e.which==3)
      return false;

  }
}

if (document.layers) {
  document.captureEvents(Event.MOUSEDOWN);
  document.onmousedown=clickNS4;
}
  else if (document.all&&!document.getElementById){
  document.onmousedown=clickIE4;
}

document.oncontextmenu=new Function("return false")