Does anyone know how to write if I want to save my old topic infront of the new that is set by the bot?

For example:
The old topic: Hey and Welcome to #channel
and when the bot change it, it will be: Hey and Welcome to #channel | Next ././././././ and so on?

One more question!
Is there anything i can write in the script so when i write !off in the chan the bot change to the orginaltopic?

Thanks
Linus