// To disable the right-click funtion on image, just add "title='protected'" to the image tag
var clickmessage = "Image protected";

function disableclick(e) {
if (document.all) {
if (event.button==2||event.button==3) {
if ((event.srcElement.tagName=="IMG") && (event.srcElement.getAttribute("title") == "protected")){
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") && (e.target.getAttribute("title") == "protected")){
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()