Need to call a functionname that is a combination of a variable & set text...help

Hi there!
I have a variable in the _root called section.
Now I want to call hemmaAnimation(); within a the global function (see below).
So I set the section variable to hemma & tried these:

_global.sectionAnimation = function(){
thissection+“Animation”;

};

_global.sectionAnimation = function(){
“section”+Animation();

};

_global.sectionAnimation = function(){
_root.section+“Animation”();

};

But no luck…
Any suggestions?

Niklas