function validEnquiry()
{
    var requiredFields = new Array('fullName', 'companyName', 'telephoneNumber', 'serviceRequested', 'enquiryMessage');
    var formComplete = true;

    for (var index = 0; index < requiredFields.length; index++)
    {
        document.getElementById(requiredFields[index] + 'Error').style.display =
            document.getElementById(requiredFields[index]).value == '' ? 'block' : 'none';

        if (document.getElementById(requiredFields[index] + 'Error').style.display == 'block')
        {
            formComplete = false;
        }
    }

    return formComplete;
}