function A (){this.name='A'}
function _extend(Class,parentClass){
if (typeof parentClass == "function"){
Class.prototype = new parentClass();
}
return Class ;
}
var B = _extend(function (){this.name='B'},A);
var bORef = new B();
log(bORef);
log(bORef instanceof A);
var C = _extend(function (){this.name='C'},B);
var cORef = new C();
log(cORef);
log(cORef instanceof A);
var D = _extend(function (){this.name='D'},C);
var dORef = new D();
log(dORef,);
log(dORef instanceof A);
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