var message="This picture cannot be downloaded. All Rights Reserved. Thank you."

function disableclick(e) {

   if (document.all) {

      if (event.button==2||event.button==3) {

         if (event.srcElement.tagName=="IMG"){

            alert(message);

            return false;

         }

      }

   }

   if (document.layers) {

      if (e.which == 3) {

         alert(clickmessage);

         return false;

      }

   }

}

function associateimages(){

   for(i=0;i<document.images.length;i++)

      document.images[i].onmousedown=disableclick;

}

if (document.all)

   document.onmousedown=disableclick

else if (document.layers)

   associateimages()

</script>