function Validate_fields(txtname, txtEmail, txtphone) {
    if (emptyField(txtname)) {
        alert('Please enter name');
        txtname.focus();
        return false;
    }
    
    if (emptyField(txtEmail)) {
        alert('Please enter email');
        txtEmail.focus();
        return false;
    }
    if (!validEmailId(txtEmail.value)) {
        alert('Please enter valid email');
        txtEmail.focus();
        return false;
    }
    if (!emptyField(txtphone)) {
        if (!isNumber(txtphone)) {
            alert('Please Enter Phone Number In Numeric Value.');
            txtphone.focus();
            return false;
        }
    }
}

function isNumber(argvalue) {
    argvalue = argvalue.value.toString();
    if (argvalue.length == 0) {
        return true;
    }

    for (var n = 0; n < argvalue.length; n++) {

        if (argvalue.substring(n, n + 1) == "0")
            continue;

        else if (argvalue.substring(n, n + 1) == "1")
            continue;

        else if (argvalue.substring(n, n + 1) == "2")
            continue;

        else if (argvalue.substring(n, n + 1) == "3")
            continue;

        else if (argvalue.substring(n, n + 1) == "4")
            continue;

        else if (argvalue.substring(n, n + 1) == "5")
            continue;

        else if (argvalue.substring(n, n + 1) == "6")
            continue;

        else if (argvalue.substring(n, n + 1) == "7")
            continue;

        else if (argvalue.substring(n, n + 1) == "8")
            continue;

        else if (argvalue.substring(n, n + 1) == "9")
            continue;

        else if (argvalue.substring(n, n + 1) == "+")
            continue;

        else if (argvalue.substring(n, n + 1) == "-")
            continue;

        else if (argvalue.substring(n, n + 1) == "/")
            continue;

        else
            return false;

    }
    return true;
}
function CheckPhone(txtphone) {
    if (emptyField(txtphone)) {
    }
    if (!isNumber(txtphone)) {
        alert('Please Enter Phone Number In Numeric Value.');
        txtphone.focus();
        return false;
    }
}