Return XML to main function?

programming flash
1

Hi guyz, im stuck here.

i have my main function:

function main(){
call_xml(“myxml.xml”);
trace(data)// NULL
}

function call_xml(){
loader.(event.Complete, oncomplete);
}

function oncomplete(){
data = new XML(evt.target.data);
trace data// OK XML
}

so, i want to get my data XML var back to main, i get NULL (i think is oncomplete fault )

how can i do that??
thanx!