jsFormValidation is free to use. But if you want to donate, please do :)
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jsFormValidation()

jsFormValidation() is a collection of JavaScript functions that limit user input into forms before they're submitted:

Try some examples:
Text only (person's name)  
Phone number (123)456-7890  
Email address (lowercase)
URL (http:// required)
Hex Color (leading # required)

Download this file:
  • download jsFormValidation.zip v1.0.3 [9.1 kB]
    HTTP | ed2k
    (first released Dec 11 2004 - updated Mar 18 2005)
These files is just available so you can browse the source online - download the zip package above to run this script
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