使用JavaScript在AdobeAIR中跟踪鼠标位置

如何使用AdobeAIR 1.5中的Javascript API在AdobeAIR中跟踪鼠标光标位置的变化？下面的代码似乎不适合我

var mainWin; //main stage
var _self={};
_self.mouse={x:0,y:0};

//Alias: air.MouseEvent=window.runtime.flash.events.MouseEvent;
mainWin.addEventListener(air.MouseEvent.MOUSE_MOVE,function(e){
    _self.mouse.x=e.pageX;
    _self.mouse.y=e.pageY;
});

我想实现的是即时通讯状态改变，随时可以聊天/离开。如果有别的办法，请告诉我

air.NativeApplication.nativeApplication.idleThreshold = 10; //10 seconds idle time

air.NativeApplication.nativeApplication.addEventListener(air.Event.USER_IDLE, function(event) { 
            //away
    }); 

air.NativeApplication.nativeApplication.addEventListener(air.Event.USER_PRESENT, function(event) { 
            //back
    });