i want to download musicI want to download music files to my ipod without deleting the old ones?

This is my first time to connect my ipod to this pc, as I used to connect it to another pc to download music.
I've been told that if it is the first time for an ipod to be connected to a PC it will delete everything on it. Is that true? And if so, how can I deal with thi want to download musicis problem? I don't want for my old files to be deleted.
You can put new songs on your iPod without deleting them:

Go to the devices column. Click on your iPod. Go to the summary, and click "manage songs manually". From there, drag the songs you want onto the ii want to download musicPod icon, and it will automatically begin syncing.

This should not delete any songs.
It will say something like "delete old songs and add new?" and just click no everytime. I'm not sure if there's a "do not ask me again" checkbox