how to global variable in function

[AS3.0]

Line 16 happened before mytext.txt was loaded, you have to trace line 16 after the text file is loaded.

onSelfEvent (load) {   
    var n:Number=0;//Declare n outside of the function.    = _root.n
    loadV = new LoadVars();                        
    MyArray = new Array();
    loadV.load("mytext.txt");  
    loadV.onData = function(s) {
        p = s.split('&');              
        for(i=1; i < p.length; i++) {            
            MyArray[i]=p[i].split('|'); 
        }
        n = parseFloat(MyArray[1][0]);
        _root.main.n =n
trace(_root.main.n)// here true value
   ready();//Call ready after the loaded text file loop.
}

function ready(){//Check _root.main.n after text file is loaded
trace(_root.main.n) 
}

} 

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