Nice extend function

Nice extend function.js

Function.prototype.extends = function(parent) {
    var sConstructor = parent.toString();
    var aMatch = sConstructor.match( /\s*function (.*)\(/ );
    if ( aMatch != null ) { this.prototype[aMatch[1]] = parent; }
    for (var m in parent.prototype) {
        this.prototype[m] = parent.prototype[m];
    }
};
// Note not Dog = Dog.extends(Animal)
Dog.extends(Animal);