Hello mate all you need is two paint scrapers so you can pop one of the small windows out at the back.
Place one scraper unde the window seal and pull forward so you can then push through to the other side of the window to pop the seal.
Leave that one in there and do the same above or below it and pop the window out. Then just open the back door from the inside.
It,s useing the same principle as if you were using tyre levers to mend a puncture if you get what i mean.
Hope this helps
Nod
Noddy ryan, October 2006