JavaScript class - Call method when object initialized

I have a class similar to the one below. How do I call my init method when the object is created? I don't want to have to create an instance of my object then call initialize like I do below.

var myObj = new myClass(2, true);
myObj.init();

function myClass(v1, v2) 
{
    // public vars
    this.var1 = v1;

    // private vars
    var2 = v2;

    // pub methods
    this.init = function() {
        // do some stuff        
    };

    // private methods
    someMethod = function() {
        // do some private stuff
    };
}