Anytime you use quotes (") that you want the end user to see, always put backslashes before.
If you often forget, I have found you can use single quotes and not have to use backslashes...example...
Instead of this...[PHP]<?php echo "Press the \"Back\" button"; ?>[/PHP]
You could probably use [PHP]<?php echo 'Press the "Back" button'; ?>[/PHP]
Perhaps Troy knows a bit more about this...