Private Msg Like Facebook

[eluser]Philip Ramirez[/eluser]
It's just a CSS class + Javascript.

CSS

Code:

.menu_disabled a:hover {
    cursor:default;
    text-decoration:none;
}

.menu_disabled a {
    color: #AAAAAA;
}

Then use Javascript (I recommend using JQuery) to add/remove the menu_disabled class from the element when a checkbox is checked/unchecked.

Facebook's implementation allows for multiple message editing and is also aware of the state of the messages.