php + javascript

[Tornado2k]

I have a php script that lists all the categories from the database.
All these categories display within the editable text box.
There is an update button below the list of categories.

1. I want to enable the update button only if any one or more of the categories is modified.

2. I also want to highlight the changed the categories before the user clicks update button.

[Dormilich]

1. listen for a change event and set the disabled property of the button to false.