Force input (textbox) to accept only floating point values

How would I capture keystrokes in a textbox such that only numbers or ONE  " . " is allowed, and nothing else?

If someone has source code or a website on this...grand!!!!

In the meantime I will google it.
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Tom KnowltonWeb developerAsked:
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Tom KnowltonWeb developerAuthor Commented:
Perfect...exactly what I was looking for...and more!
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Tom KnowltonWeb developerAuthor Commented:
thx
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