i have this function: function telephoneValidator(formObj) { if (formObj.Telephone.value.length < 10) { alert("Please enter a valid Telephone number. Telephone numbers should be at least 10 digits and no more than 18 digits in length."); formObj.Telephone.focus(); return (false); } return (true); } i would like to validate it further by making sure there is a leading 0 (zero) at the beginning of the number (like 01256354212), the digits should not exceed 18, so far i've been able to validate only <10 and finally only numbers allowed. Can anybody help? Thx    More>>