//https://stackoverflow.com/questions/19646276/javascript-email-and-phone-validation
function isNumber(evt) {
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        alert("Please enter only Numbers.");
        return false;
    }

    return true;
}

function ValidateNo() {
    var phoneNo = document.getElementById('txtPhoneNo');

if (phoneNo.value == "" || phoneNo.value == null) {
        alert("Please enter your Mobile No.");
        return false;
    }
    if (phoneNo.value.length < 10 || phoneNo.value.length > 10) {
        alert("Mobile No. is not valid, Please Enter 10 Digit Mobile No.");
        return false;
    }

    alert("Success ");
    return true;
}



function validateEmail() {

    var email = document.getElementById('txtEmail');
    var mailFormat = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

    if (email.value == "") {
        alert( "  Please enter your Email Id  ");
    }
    else if (!mailFormat.test(email.value)) {
        alert( "  Email Address is not valid, Please provide a valid Email ");
        return false;
    }
    else {
        alert(" Success ");
    }

}