/*JavaScript Unleashed, Third Editionby Richard Wagner and R. Allen Wyke ISBN: 067231763XPublisher Sams CopyRight 2000*/Credit Card Validation Credit Card Validation size=16 maxlength=16 name="data"> name="CheckButton" value="Validate" onClick="document.form1.result.value = '' + isCreditCard(document.form1.data)">Result size=16 maxlength=16 name="result">