function disableclick(e) {
     if (document.all) {
          if (event.button==2||event.button==3) {
               if (event.srcElement.tagName=="IMG"){
                    alert(clickmessage);
                    return false;
               };
          };
     } else if (document.layers) {
          if (e.which == 3) {
               alert(clickmessage);
               return false;
          };
     } else if (document.getElementById) {
          if (e.which==3&&e.target.tagName=="IMG"){
               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.getElementById) {
 document.onmouseup=disableclick;
} else if (document.layers) {
 associateimages()
};
</script>
<img src="17.jpg" galleryimg="no">