Just a FYI: The Odin one-click version linked in this thread may remove the 3-button combo on some phone models making it a little more difficult to get in to recovery and/or download mode. Here is another version which is not a "one-click", it's actually like 4 clicks - lol, but it does not jack up the 3-button combo and will also fix it if you've lost it.
{Stock Rom} Odin JF6 with 3 button fix - xda-developers
Also, you must have Odin open and ready prior to plugging your phone in to the computer - VERY IMPORTANT. Here is my procedure but YMMV:
Open the Odin I linked
Click on the PIT button within Odin to browse to and select the PIT.pit file
Click on the PDA button within Odin to browse to and select the PDA.tar file
With phone turned off, hold down both the vol up and vol down buttons while you plug in the USB. (Use the USB that shipped with your phone if at all possible).
Your phone will take a sec and display a yellow screen with a triangle and the word Downloading... at which point you can let the vol buttons go.
If your phone is recognized by Odin you will see a yellow box light up within Odin stating [COMx] where x is a number. If you don't see the yellow box the phone is not recognized so try again from the beginning.
Click on the Start button within Odin and watch the magic happen. The phone will reset when it is done and you should unplug the USB at that time.
Once you do it the first time you will understand exactly how to do it if you ever need to again. Hope this helps and happy flashing.