function preloadImages() {

  if (document.images) {
    if (typeof(document) == 'undefined'){
      document = new Object();
    }
    document.loadedImages = new Array();
    var argLength = preloadImages.arguments.length;
    for(arg=0;arg<argLength;arg++) {
      document.loadedImages[arg] = new Image();
      document.loadedImages[arg].src = preloadImages.arguments[arg];
    }
  }
}

am = "This function is disabled.";

bV  = parseInt(navigator.appVersion)
bNS = navigator.appName=="Netscape"
bIE = navigator.appName=="Microsoft Internet Explorer"

function nrc(e) {
   if (bNS && e.which > 1){
      alert(am)
      return false
   } else if (bIE && (event.button >1)) {
     alert(am)
     return false;
   }
}

document.onmousedown = nrc;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (bNS && bV<5) window.onmousedown = nrc;