title: jquery - validate characters on keypress?
body: <p>I have a form text field that I want to allow only numbers and letters in.  (i.e., no #$!, etc...)  Is there a way to throw up an error and prevent the keypress from actually outputting anything if the user tries to use any character other than numbers and letters?  I've been trying to find a plugin, but haven't really found anything that does this... </p>