[xml]characters not compartible with XML

I have a database driven intranet that is actively used by users to update
the intranet. But i am noticing that each time a userr enters a double
quote( " ") or ambersand( & ), the intranet crashes.

How can i avoid this problem? As i need the users to be able to put anything
in to the database and be able to view them without crashing.





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