@tobeytailor (with code) How to create private variable and functions in def.js ?

below is a sample code . how I can create a variable which is accessible in all functions like init(), next(), back() but now outside to "SlideStreamer"

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def ("SlideStreamer") ({

    init: function(url){
        var0 = url; // globle variable
        this.var1 = url; //public variable
        var var2 = url; //private to init only. cannot use it in next() function
   
    },

    next: function(){
   
       
        alert("Public function..\nvar0 = " + var0); //"timing.xml"
        alert("Public function..\nvar1 = " + this.var1); //"timing.xml"
        alert("Public function..\nvar2 = " + var2); // var2 undefined here, How Can i get var2 here ???
       
    }
});

var mySlideshow = new SlideStreamer("timing.xml");
mySlideshow.next();
alert("Outside..\nvar0 = " + var0); //"timing.xml" ?? It means, var0 becomes a global variable !!
alert("Outside..\nvar1 = " + var1); // var1 undefined here
alert("Outside..\nvar2 = " + var2); // var2 undefined here
alert("Outside..\nvar0 = " + mySlideshow.var0); // var0 undefined here
alert("Outside..\nvar1 = " + mySlideshow.var1); // "timing.xml" !! It means this is a public variable
alert("Outside..\nvar2 = " + mySlideshow.var2); // var2 undefined here.

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