Java Script no executing on MAC platform

Hello All:
I am trying to use a Java Script on my personal website to block use of the right mouse button so images can not be saved from my website. I found a script that works great on the PC (IE8) but when some of friends on the MAC platform give me feed back the script does not seem to be executing properly (my page and images are wide open). So my question is: is there a solution to this problem and how do I fix it?
Here is the script (I am not the author) and it is placed in the <head> on each page. Also, here is a link to my website and the test pages where the script is working on the IE platform: http://twolabphotography.com/Galleries/Wyoming%20Web%20Gallery/index.html
<script type="text/javascript">
document.onmousedown=disable; //IE
message="Sorry no rightclick on this page.\nNow you cannot view my source\nand you cannot steal my images";
function disable(e)
if (e == null)
{ //IE disable
e = window.event;
if (e.button==2)
alert(message);
return false;
document.onclick=ffdisable; //FF
function ffdisable(e)
if (e.button==2)
{ //firefox disable
e.preventDefault();
e.stopPropagation();
alert(message);
return false;
</script>
Any help or suggestions would be appreciated. OBTW, java scripting is a bit over my head and this is the first time I have been attempted to use it on my website.
John Munro
[email protected]

I am trying to use a Java Script on my personal website to block use of the right mouse button so images can not be saved from my website.
John:
This is so 90's. It's an impossible feat - just accept the fact that you CANNOT prevent this and do something useful instead. If someone wants your images, they will get them in any of a variety of ways, the simplest being just disabling javascript in the browser.
What do you do about those left-handed people who have their buttons reversed?
What do you do about those who take a screen capture of your image?
If you don't want your images taken, don't put them on the web.

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