Help you do what, exactly? This reeks a lot of being a homework assignment; if it is, admit it up front.
What have you tried? It's pretty trivial, in either Perl or JavaScript to write a regex (that would look something like this: m/^[0-9]{1,3}$/ to check for 1 through 3 digits in a field. In JavaScript, you could also do a string->integer conversion (there's a function) and handle the error if /^\D/ and the range if 0 > entry > 999 (do you really want to allow ages to 999? I don't know; you didn't specify it!
emc
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.
—Igor Sikorsky, reported in AOPA Pilot magazine February 2003.
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