Remove Mac Partition

Hi all, my iMac's hard drive crashed after only 3 1/2 months. (bought brand new in Nov. 07) I just got my iMac back, they replaced the hard drive. However, the idiots partitioned my hard drive. I really don't care for it like that and wanted to know how or can I, remove the partition and make my two hard drives one. Without having to reformat, at any rate.

Thanks in advance,

sisu
iMac, 20"
Intel Core 2 Duo
250 GB (split into 2), 800 MHz
OSX 10.4.11

 

mac partition

Ah, I was so afraid of that... Guess I'll just learn to live with it this way. I really appreciate your replies and I'm really happy to have stumbled upon this site.
Thank you both so much.

sisu