Enter a number. Using AJAX, this will show you its factors. If you enter a negative number, a message will slide down to complain. If you enter something that does not match the regular expression "\d*", a message will fade in to complain.
http://cs.nmu.edu/~rappleto/Classes/CS460/jQeury-Ajax/

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Number to factor:

2 3 4 6 8 12