disable button

Hi,

I have a button that when clicked, lets the user edit something.
Now, i only want the user edit ONCE. so, I want to remove/disable the "edit" button when he's clicked it once already.

I tried ~[Filtered JS Events]~=this.disabled=true

but unfortunately, it didn't work.
By the way, I'm using HTML together with php and javascript.

Thank you!

you can trash this post already..^^
i was able to figure it out eventually

Thank you.