function valid_Contact(txtSellerName, txtEmail) {
    if (emptyField(txtSellerName)) {
        alert('Please enter first name');
        txtSellerName.focus();
        return false;
    }
     
    if (emptyField(txtEmail)) {
        alert('Please enter email');
        txtEmail.focus();
        return false;
    }
    if (!validEmailId(txtEmail.value)) {
        alert('Please enter valid email(eg. you@domain.com)');
        txtEmail.focus();
        return false;
    }
}

function valid_testimonial(fname, lname, email,cname) {
    if (emptyField(fname)) {
        alert('Please enter First Name');
        fname.focus();
        return false;
    }
    if (emptyField(lname)) {
        alert('Please enter Last Name');
        lname.focus();
        return false;
    }
    if (emptyField(cname)) {
        alert('Please enter Company Name');
        cname.focus();
        return false;
    }
    if (emptyField(email)) {
        alert('Please enter Email');
        email.focus();
        return false;
    }
    else {
        if (!validEmailId(email.value)) {
            alert('Please enter Valid Email');
            email.focus();
            return false;
        }
    }
}