function verifyElement(elementName)
{
    var result = false;
    
    var nameElement = document.getElementById(elementName);
    if (nameElement == null)
    {
        return false;
    }

    if (nameElement.value != '')
    {
        nameElement.style.backgroundColor = '#FFFFFF';
        result = true;
    }
    else
    {
        nameElement.style.backgroundColor = '#FDEDDE';
    }

    return result;
}

function verifyMailValues()
{
    var itemsOk = true;
    var emailOk = true;
    var phoneOk = true;

    if (verifyElement('mailName') == false)
    {
        itemsOk = false;
    }
    if (verifyElement('mailCompany') == false)
    {
        itemsOk = false;
    }
    if (verifyElement('mailEMail') == false)
    {
        itemsOk = false;
    }
    if (verifyElement('mailPhone') == false)
    {
        itemsOk = false;
    }
    if (verifyElement('mailMessage') == false)
    {
        itemsOk = false;
    }

    if (itemsOk)
    {
        __doPostBack('__Page', 'SendMail');
    }
}