Choose About this Mac from the Apple menu, click on More Info, and check the model identifier against the following, which are the earliest Macs of each type that can run Mountain Lion:
If your computer doesn't support 10.8, phone the online Apple Store and order a download code for 10.7.
its a macbook 4,1 .. which isnt stated on your comment, so that kind of worries me. do i have to upgrade to 10.7 to upgrade to lion? if so, how do i do it, how much does it cost? if thats the case, then its kind of stupid how you have to upgrade to a newer version to get another newer version, why couldnt they just make it minimal system requirements instead of it varying on models.