Nav message on Avic N1

Well i purchased the avic n1 and love the unit but i have 2 more question,

1 when i turn the car off and then turn it on everytiime i get a stupid acceptacnce message from the nav system tellime me how to use it and i have to hit ok, is there anyway to get rid of this everytime i shut the car off?

2  Im not crazy about swaping the nav cd evertime i want ot go somewhere, is there a way to plug maby another cd player of dvd changer to avoid this?

Thanks for all your help

adam

sorry I forgot one more question

I know you can change the background pic but for some reason mine is not working. I made it the same size as the free pics on there website 1000 x 480 pixels but when i try to use them it says disk error, any idea why?

Several things for the background pic CD:

Recommendation:

jpg format

MUST:

1. Finalize the CD session (close it)

2. Under BG directory put your jpg background files

3. CD has to be 10MB or greater in SIZE!!!!  So put some data file if your cd doesn't meet this requirement...except for mp3 files of course.

Have fun.

ps. 480x234 is the exact pixel size for the background.