[Selite]

Don't you have to use caps in the line

SlashCmdList["BLAH"] = whatever()

You could try this block of code;

TOGGLE_HELM1 = "/togglehelm"
SlashCmdList["TOGGLE_HELM"] = function()
    ShowHelm(not ShowingHelm())
end
TOGGLE_CLOAK1 = "/togglecloak"
SlashCmdList["TOGGLE_CLOAK"] = function()
    ShowCloak(not ShowingCloak())
end

Not sure if they'll work, as I am super tired, and they are dry coded.

EDIT : See above post, it's more right.