function clickIE() {
	if (document.all) {
		return false;
	}
}

  function clickNS(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=clickNS;
  } else{
          document.onmouseup=clickNS;
          document.oncontextmenu=clickIE;
  }

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