[Fizzlemizz]

You can create any frame you want to "popup/show()" your messages

local function ShowMessage(text)
    if not JDoubleU00MessageBox then
        local f = CreateFrame("Frame", "JDoubleU00MessageBox", UIParent)
        --- Whatever your heart desires to see any messages plus a close (hide) button
        function f:SetText(text)
             -- Depends on your frame setup above how the text is "set"
        end
    end
    JDoubleU00MessageBox:SetText(text)
    if not JDoubleU00MessageBox:IsShown() then
        JDoubleU00MessageBox:Show()
    end
end
if JWFav == 0 then
    ShowMessage("You do not have any mounts selected as a favorite.")
end