getting kdm login from booting knoppix CD

:roll: anybody knows about how to get the "kdm" login by default while booting from the knoppix cd.
I have tried it , but in different way, like,
booting the cd in init level-3 and the giving the "kdm" command , it goes into kdm , but i want these to be default to start at init level-5, so which is the file to be changed for that.
plz tell me its very urgent. so that it should ask for the authentication during the booting of the knoppix from CD.
thanks in advance :roll: