function validate ()
{
   if (document.ai5.biz_name.value == "")
    {
        window.alert('Please supply the name of the business');
        document.ai5.biz_name.focus();
        return false;
    }
    else if (document.ai5.realname.value == "")
    {
        window.alert('Please supply the contact name');
        document.ai5.realname.focus();
        return false;
    }
    else if (document.ai5.day_phone.value == "")
    {
        window.alert('Please supply a phone number');
        document.ai5.day_phone.focus();
        return false;
    }
    else if (document.ai5.email.value == "")
    {
        window.alert('Please supply an email address');
        document.ai5.email.focus();
        return false;
    }
    else
    {
        return true;
    }
}