Stupidly partition hdd on window7 in IMAC A1311, and now I can not use the IMAC...... Need some help

Just bought a used IMAC A1311 core 2 duo, and there are something called Bootcamp and Window7 on it, and i log in to Window7 and stupidly partition hdd on it, and i think it has formatted everything. now the window7 is error and I do hold (alt) key when I start up the machines , it show only the window7 hdd  and i don't see any Recoery HDD........what should i do? Really need some helps right now.........

There are several models that use A1311. So I don't know exactly what model you have. If you received installer discs with the computer, then you will need to boot from Disc 1, erase the drive, and install Snow Leopard. Some models in the A1311 line can use Internet Recovery:
Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.

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