You need one server behavior for each form on the page
I need 2 Server Behaviors. One for new users and one for registered user. I was able to do it when I found this thread
showthread.php?t=19020&highlight=server+validations
At first I thought I just needed to change to a random number but I downloaded the zip file I noticed that there were 2 Server Behaviors. The only thing I need to do was to change the login form Show if to the correct error message number.