Partitioning on mac, HELP!

I tried to partition my mac with windows 8, I prepared the disk, then I tried to set up bootcamp, and it came up with that I had to only have one disk and no other partitions, so I found out that I had 3 disks from different operating systems, which now aren't used anymore and don't have anything on, I tried to look on forums on how to delete, or merge the disks. I tried to do use disk utility and find the partition tab, although it wasn't there, and then I don't want to waste money on iPartition, can anyone help me as I cant find a simple way to merge them, as all the others don't work, please help me.

Thanks

 

Hi Thanks, I tried it although it came up with the reply MediaKit reports no such partition, what does this mean and how should i resolve it, thanks

 

It comes down as a box from the disk utility menu, in a minute I will give you a screenshot, and I am using mac os x snow leopard on an iMac and it reports an error saying "MediaKit reports no such partition"

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I could find a screenshot on the internet though:
http://blog.scottmroberts.com/__oneclick_uploads/2009/04/picture-2.png

although it says MediaKit reports no such partition

 

I do but I don't have it on me at the moment, is there any reason why it doesn't report the partition is it in the format that I have it, also I booted into my snow leopard dvd and used disk utility there, and I tried to delete on of the drives, and it didn't report the same message but instead nothing happened when i clicked the minus button, although there was a small bar saying "unmounting disk" and "Finishing partition modifications" and "Partition Complete" but then the disk didn't disappear, I also have a Free space as another disk, and I tried to convert that to Mac Os Extended (Journaled) but it said "the chosen size is not valid for the chosen filesystem" it was 343.9 MB, how do i get rid of that? Thanks for helping me

 

Don't worry, while playing around with disk utility I erased one of the disks and clicked on Mac Extended, then somehow it erased it because it was a Mac Extended partition (sorry if this doesn't make sense, I didn't really understand what I did) then I got all my disk back and I was able to partition the disk, now I am hoping that the installation will work on my computer. Thanks for helping, it was much appreciated!