function validate_msisdnform(){
    var err = '';
    
    if ((document.regform.mobile1.value.length < 3) || (document.regform.mobile2.value.length < 3) || (document.regform.mobile3.value.length < 4))
        err = err + '* Missing a valid 10 digit phone number\n';
   
    if (document.regform.taccheck.checked == false)
        err = err + '* You must agree to the Terms and Conditions\n';
 
    if (err.length > 0) {
        alert('Please resolve the following problem(s) with your submission\n\n' + err);
    } else {
        document.regform.submit();
    }
}