Is there a way to pass parameter to the Scene function which is created by CocosBuilder?

I have a GameScene which is created by CocosBuilder. Normally the function is like this:

var GameScene = function(){};

GameScene.prototype.onDidLoadFromCCB = function()
{
}

GameScene.prototype.onBackButtonPress = function()
{
}

Is there a way to pass parameter to the function like this:

var GameScene = function(param1, param2){};

Thanks

Or in anther word, how can I create member variables for GameScene so that I can pass values after I load the CCB file like this:

var scene = cc.BuilderReader.loadAsScene(“GameScene.ccbi”);
scene.param1 = 1;
scene.param2 = 2;
cc.Director.getInstance().replaceScene(scene);