How to install windows 7 through a bootable usb?

I had tried to install windows 7 on my imac running os lion through a bootable usb as it's superdrive is broken.
Firstly I created the bootable usb of windows 7 from my friend's laptop using the instructions on this website
http://windows.appstorm.net/how-to/windows-7/how-to-create-a-windows-7-installat ion-usb-drive/
but bootcamp would raise an error saying disk could not be found. So I modified the info.plist file from bootcamp package contents and created an iso of the bootable usb drive. Bootcamp then allowed to create a windows install usb through the iso and partitioned the hard disk too but after doing so the computer restarted with a black screen and a message ' insert boot disk and press any key'. Now I've deleted the windows partition and really need help installing windows 7.

You can only install Windows 7 from an USB drive if your Mac didn't come with the SuperDrive.
I know that you can modify the Boot Camp Assistant Info.plist to show the option to create a bootable USB drive, but the problem is that the firmware of your iMac doesn't allow it. Use a Windows 7 DVD

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