Disable Option List Control with JavaScript

Can someone provide some code demonstrating how to disable an ASP.Net option list control from the client-side using javascript? I can disable textbox, dropdown and list controls by using the following javascript:

document.myForm.myTextBoxCtrl.disabled = true
document.myForm.myDDownCtrl.disabled = true
document.myForm.myListCtrl.disabled = true

But this does not work for the option list control. Please help.

Thanks

I solved the problem. The correct syntax is as follows:

document.getElementById("myOptionListCtrl").disabled = "true";

I hope someone else can benefit by this. Thanks :)