Validation in javascript

[Dimi Cost]

I must validate a textbox that is an input for credit card.I try and find this code.I would like your opinion.Thanks.

<script>


function validate()
{
var cardexp=/^\d{4}\s{0,}\d{4}\s{0,}\d{4}\s{0,}\d{4}$/


if (!cardexp.test(document.frmname.fldname.value)) 
{
document.number.fldname.value="Please enter your credit card number";
document.number.fldname.focus();
return false
}

}

</script>
<input type="text" size="10" maxlength="9" name="number" value=""  onmouseout="return Validate()"/>

[Nile]

Try this: http://www.evolt.org/node/24700