Before close stop close w/msgbox

I am trying to make a msgbox that will come up under a before close event if a condition is met. If they answer yes then I want another message box to pop up and then they can close the application. This part seems to be working fine. The problem I have is if they answer no then I want excel to not close and I can't seem to get this to work.
This is what I have so far:

Please Login or Register  to view this content.

Any ideas?

That is almost perfect but for some reason If they say no then the msgbox that I set up for yes still pops up. I tried moving the If vbno ahead of the Ivbyes and that didn't work.