Is it possible to fire a function with a String?

I have a function in the Global and I would like to fire it with a string witch is passed from a function.
For example:

var _sfunction = 'myfunction'
function fireMyFunction(_sfunction){
	globals[sfunction]
}

function myfunction (){
	application.output("myfunction ")
}

Is that possible somehow ?

Standard JavaScript: globals’theName’

Paul