Since your question is of ultimate unclearness, I will try to do some mind-reading, which OriginalGriff refuses to do. :P
Are you trying to create a button rollover effect? This is how to do it if you are doing WPF:
http://msdn.microsoft.com/en-us/library/cc294737.aspx[
^]
I gave this example to you to show you how to be specific. Please post what you are trying to do, which platform/language/etc... and specially what you have done so far. The people here get very upset on questions that include phrases "please give me code". And your question should show that you have committed some effort towards your problem. Otherwise it looks to the guys here like you are trying to get your work done by them.