Follow on/off toggle?

Hi all, been reading the boards for some time now. Just got around to registering as I decided to give dual boxing a shot and maybe take it farther in the future.

Basically, what I'm looking for is a one button toggle for follow on/off on my secondary character. I'm trying out a feral druid/warlock duo with my druid as main. I assume since command line movement functions were taken out of wow in 1.6 and there's no /stopfollow type command (AFAIK) the easiest way to do this would be through a conditional command in AHK, but I have not been able to dig up any info on how to set something like this up.

If anyone can point me in the right direction, it would be much appreciated. Many google and forum searches have come up with noting.

To turn follow on:

/follow charactername

To turn follow off:
Bind follow off to any movement key (backwards is the best as you move the least).

You can also enter combat and melee or cast a channeled spell.

As Xzin said - /follow used to be a toggle on/off command in wow, but for some reason they changed it a while ago. Now you can start autofollow, but can't stop it through a command. Only way is to start something else. Casting a spell typically doesn't work (flags the error "cannot cast while moving") so, again as Xzin said, i have my "stop autofollow" button as tapping a key bound to backwards.