Change Button content when Radio button clicked...

Within my BSP code I have an OnClientClick event against the Radio button tag.

What I need to do is to have some kind of Javascript that changes the context (text) or colour of a button if the Radio button is clicked.

I know very little of how to achieve this and would relish any guidance about how I can get this to work.

I understand that I need to use a reference/handle to the button and change it's values via javascript, but how can I embed this code into my BSP code, what code do I use, and more importantly how can I obtain this reference/handle on the buttion?.

Jon