<!-- from JavaScripter.net. Copyright © 1999-2000, Alexei Kourbatov -->
<!--
overImage=0;

function mouseDown(e) {
 var clickType=1;
 var tgt="";
 if (parseInt(navigator.appVersion)>3) {
  if (navigator.appName=="Netscape") {
   clickType=e.which;
   tgt=""+e.target;
   if (tgt.length!=0 && tgt.charAt(tgt.length-1)=="#") 
    overImage=1;
  }
  else {
   clickType=event.button;
   if (""+event.srcElement.className=="disabledMenu")
    overImage=1;
  }
  if (clickType!=1 && overImage) {
   alert ('This image is copyrighted. Please ask permission from owner for your usage.')
   return false;
  }
 }
 return true;
}
if (parseInt(navigator.appVersion)>3) {
 document.onmousedown = mouseDown;
 if (navigator.appName=="Netscape") 
  document.captureEvents(Event.MOUSEDOWN);
}