Hi Bob,

I suspect the Telerik controls are using some JavaScript so you probably stumbled onto a correction just by changing the Ajax manager. You did have it before any Ajax controls in the order right?
Tim

>Hi Paul,
>
>The Javascript error is being caused by the Telerik controls that I have on my page. I do not have any client side code (I wouldn't know how to write or add it to the page) in the form. I have a Telerik Ajax manager on the form as well as a Telerik Grid and I changed the Ajax manager (which determines what controls get refreshed and what graphic is displayed during a postback) and the problem went away. Still not sure exactly what was wrong but it appears to be a Telerik bug.
>
>Thanks for you help.
>
>>
>>It's a Javascript error. Do you have any custom JS code attached to anything? Are you populating the grid data in the NeedDataSource event?