I agree, look at how it is attached, then look at ways to either add a sacrificial fence or either build a new one or buy a new one.
There are tons of ideas on the web for DIY table saw fences and depending on how often you are going to use it, along with what you will use it for, a DIY fence maybe the way to go. If you think you will be using it a LOT and for big projects, then I would be looking at buying a new Table Saw.
There are Table Fence Clamps that are designed for DIY fences, you simply drill two holes in the top of the fence and clamp them to your existing fence. This way the clamps don't get in the way when cutting wood. This way you can have any length you want.
These are the clamps
Miter Gauges & Clamps - Fence Clamp
A very good source for almost anything is Pinterest. Take a look here for some DIY Fence Ideas
Hope this helps