function validateLogin(validationid, usernameid, passwordid, formid, url)
{
    $(validationid).style.display = "none";
    
    var username = $(usernameid).value;
    var password = $(passwordid).value;
                
    var parms = 'username=' + username + '&password=' + password;
    new Ajax.Request(url,
        {            
            method: 'post',
            parameters: parms,
            onSuccess: function(transport, responseJSON)
            {
                if (responseJSON.IsValid)
                {
                    $(formid).submit();
                }
                else
                {
                    $(validationid).update(responseJSON.ValidationErrorMessage);
                    $(validationid).style.display = "block";
                }
            }
        }
    )
    return false;
}

function goRegistration(formid, action)
{
    $(formid).action = action;
    $(formid).submit();
}