Dynamicly changing arguments for [js]

I'm using the example code from the [polybuffer~.maxhelp] file for loading the polybuffer~ using JavaScript in the [js] object. (You can find this example under the "JavaScript" tab in the polybuffer~.maxhelp file.) I need to be able to change the second argument of this [js] file however, the one that sets the target polybuffer~ name. I guess this requires a change to this line of code: var pb = new PolyBuffer(jsarguments[1]);. I don't really know much about JavaScript though. What change do I need to make in order to dynamically change the [js] argument?