Type Sys.UI._Timer has already been registered

Having a webpage with multiple update panels and multiple timers might be bit annoying when you the below error:-
Sys.InvalidOperationException: Type Sys.UI._Timer has already been registered

If scripts are loaded using an user control update attributes for asp:ScriptManager as follows

Hope this have helped someone like me hanging around.

"It’s hardware that makes a machine fast. It’s software that makes a fast machine slow."
- Craig Bruce