Trouble with kses.php

I’m having a little trouble with my website. I need to add two new attribute types to be allowed in the source editor. I need to add data-flv and data-mp4. These two attributes need to used on both a a (anchor) tag and the img (image) tag.

I have added them to the kses.php file but the editor still strips them when i jump between source and visual views. How do I prevent this? Do I need to re-run a configuration script? If so what would I run.

Here is a snippet of the changes I have made to the kses.php file.

$allowedposttags = array(
		'address' => array(),
		'a' => array(
			'class' => array (),
			'data-flv' => array (),
			'data-mp4' => array (),
			'href' => array (),
			'id' => array (),
			'title' => array (),
			'rel' => array (),
			'rev' => array (),
			'name' => array (),
			'target' => array()),

<<<OMITTED SOME >>>

		'img' => array(
			'alt' => array (),
			'align' => array (),
			'border' => array (),
			'class' => array (),
			'data-flv' => array (),
			'data-mp4' => array (),
			'height' => array (),
			'hspace' => array (),
			'longdesc' => array (),
			'vspace' => array (),
			'src' => array (),
			'style' => array (),
			'width' => array ()),