vB3 WYSIWYG Editor - run JavaScript code onkeyup

[Scandal]

Hi all!
I'm trying to run a block of code when user do keyup on the editor of vBulletin 3.

The relative vBulletin script is on /clientscript/vbulletin_textedit.js (you have to beautify it, for example via this page, to see the code in humanity way ).

For example I have add the following code on the relative line, but with no result:

			this.editdoc.addEventListener("keyup", function(){
				alert('test!');
			});

Any idea?

[Scandal]

Any idea how to run the code?