A4 door switches
 

Iv'e just bought a 2002 A4 1,9 tdi with no handbook.Looked on ebay for one but they are silly money .Can anyone tell me what the 2 switches in the drivers door are for please?I know 1 is central locking,but the one with the image of a car on a hill foxes me.It looks like a hill start.Also what does the esp switch do?