AJAX :: Show The Html Editor As Read-only?

In my webform I want to show the html editor as read-only. Can anybody post complete code to implement this.

I am viewing the webform in Internet Explorer. I am getting the dreaded javascript event is null or not an object error. This is what I tried without luck .

In aspx page:

<script type="text/javascript" language="javascript">
<!--
function MyEditoractiveModeChanged(sender, activeModeChangedArgs) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; switch (activeModeChangedArgs.get_newMode()) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; case AjaxControlToolkit.HTMLEditor.ActiveModeType.Design:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#36;get('MyEditor_ctl02_ctl00').contentWindow.document.body.onkeydown = function() {

[Code]....