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Check for Number
SAMPLE CODE <script> <SCRIPT type="text/javascript" > function chkNumber(){ var varInput = frmGetNumber.theinput.value; if (isNaN(varInput)) { alert(varInput + " is an invalid number"); } else { alert(varInput + " is a Valid Number"); } } </script> <form name="frmGetNumber"/> <input type="text" value="" name="theinput" size="5" maxlength="5" > <br><br><br> <input type="button" value="Check for Numeric" onClick="chkNumber();"> </form>