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;");