Help Understanding setInterval() and call()

programming flash
1

I’ve looked up setInterval() and call() but I’m having a hard time understanding it still. I’m hoping someone can explain to me a bit better. I’m in the process of learning OOP and I downloaded a small file and am editing it a bit and trying to read the code and follow it to better understand. However, I am stumped on one thing - where is ‘m’ coming from? No where in my code is ‘m’ being set other than this function and when I trace it, it outputs the name of an mc as ‘_level0.mmi0’. And why does it need to “call” it? Thanx in advance.

private function setTimeout(f:Function, t:Number) {
if (interval != undefined) {
clearInterval(interval);
}

    interval = setInterval(
        function (m) {
            trace(m);
            clearInterval(m.interval);
            f.call(m);
        }, t*1000, this);

}