function validateContactForm()
{
    var f = document.getElementById("ContactForm");

    if (trim(f.FullName.value) == "")
    {
        alert("Please enter your name.");
        f.FullName.focus();
        return false;
    }

    if (!isEmail(f.EmailAddress.value, false))
    {
        alert("Please enter a valid email address.");
        f.EmailAddress.focus();
        return false;
    }

    if (trim(f.Phone.value).length < 10)
    {
        alert("Please enter your 10-digit phone number.");
        f.Phone.focus();
        return false;
    }

    return true;
}

function submitContactForm() 
{
    if (!validateContactForm()) return false;

    document.getElementById("ContactForm").submit();
}