.Net is kindly changing the element ids on my pages by appending a ct100_ to them. As much as I appreciate microsoft trying to help me keep from duplicating ids on my site,
to not use anything on the server side.
This is an inherent aspect of the ASP.NET system, and there is no way to use .NET Server controls and not have the prefixes appended.
To access the client-side name, you can use the myControl.ClientID property.