function click_mouse(b) {
  if(((navigator.appName=="Microsoft Internet Explorer")&&(event.button > 1))
  ||((navigator.appName=="Netscape")&&(b.which > 1))){
  return false;
  }
}
document.onmousedown = click_mouse;
document.oncontextmenu = new Function("return false;");
document.onload = setInterval("window.clipboardData.clearData()",1000);