How to install Mac OS 10.7.4 onto external USB HD

My Imac is showing early show of serious bernel paroblems/crashing.  (For example, it has tourned it self off then on two times, the opening or new software as well as Internet seraches are dealy slow, a large black rectangle, showed up on the desk over the finder and then disappear.
I have done this: run Disk Utilities, run download Disk Warrior.  Some problems remain.
In order to run Disk Warrior to cealnup my hard drive, I need an actual disk for start up (which will arrive in two weeks or less), or can start the machine up from my external USB @ drive.
I need the fix now, so how do I "install Mac OS on the external drive"?
Thanks for any thoughts.

Restart with the Option key held down and use Lion's recovery partition to install onto that drive. Alternatively, clone your existing system to that drive, run DiskWarrior on the clone, restart from the clone, and use DiskWarrior to repair the internal drive.
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