I think I see what you're trying to do. First off go get Jamba, it'll change your life.

A lot of people set up their targeting or heal macros to fail over to another target, like "heal my focus' target, if that fails heal my focus, if that fails heal my target, if that fails screw it heal me". It looks like that's what you're trying to do.

The way people tend to set up focus is they use the same function keys that they use to switch PiP windows in keyclone.

Say you're running 5 windows and your maximizer regions are bound to F8-F12.

If you bind /focus Muhata to F8 in all 5 windows, then /focus Muhatu to F9 in all 5 windows, etc etc, then whenever you switch windows with keyclone it also changes the focus to that toon. Check the link Solon gave.

I did a thread where some great advice was given to me, and Jafula (the guy who made Jamba) gave good advice, Look in here Zorba did some neat things too, check this out .

Hmm looks like one of your first formats
/focus [target=Muhata,help,nodead]; [target=Mahatu,help,nodead]; [target=Mahate,help,nodead]; [target=Muhaty,help,nodead]; [target=Muhato,help,nodead]
is the exact syntax that aetherg mentioned in the Macro Codex (not all of the Codex made it to the Wiki I think) and your later

/clearfocus
/focus Muhata
/stopmacro [target=focus, exists, nodead]
/focus Mahatu
/stopmacro [target=focus, exists, nodead]
/focus Mahate
/stopmacro [target=focus, exists, nodead]
/focus Muhaty
/stopmacro [target=focus, exists, nodead]
/focus Muhato

is IT Monkey's right out of the Wiki.

This might be a dumb question, but how do you know that nothing happened? Setting Focus doesn't give a visual indicator unless you have an addon that shows it. Your macro may be working fine, unless you have set up a test macro like /cast [target=focus] random buffing spell and see which toon it lands on.