myclasses = {};

myclasses.A = function(parm1) { this.parm1 = parm1; };
myclasses.A.prototype.afunction = function() {};

myclasses.B = function(parm1, parm2) {
    myclasses.B.superConstructor.call(this, parm1);
    this.parm2 = parm2;
};

FORK.extend(myclasses.B, myclasses.A);
myclasses.B.prototype.bfunction = function() {};