Making an image unselectable?

Hello all,
I'm trying to make an image unselectable, when you press CTRL + A (select all) I don't want it to highlight blue or when you drag on the image. I can't find anything about it on google, and I've seen it done before.. anyone know how to do this?

In Firefox and Webkit you can set the CSS properties -moz-user-select and -webkit-user-select to none. This will restrict users from selecting text with the mouse or with CTRL-A, assuming there's no override in the user stylesheet.

Code:

<s-tyle>
body {
-moz-user-select: none;
-webkit-user-select: none;
user-select: none;
}
</style>