function checkEntries(frm)
{
    if (frm.forename.value == "" && frm.surname.value == "")
    {
        alert('Please enter your name');
        frm.forename.focus();
        return false;
    }

    if (frm.tel.value == "" && frm.email.value == "")
    {
        alert('We need either a telephone number or an email address to contact you');
        frm.tel.focus();
        return false;
    }
    return true;
}