text: /**
  	@constructor
  	@example
  	var _index = new Hash();
  	_index.set("a", "apple");
  	_index.set("b", "blue");
  	_index.set("c", "coffee");
  
  	for (var p = _index.first(); p; p = _index.next()) {
  		print(p.key+" is for "+p.value);
  	}
  	
   */
  var Hash = function() {
  	this._map = {};
  	this._keys = [];
  	this._vals = [];
  	this.reset();
  }
  
  Hash.prototype.set = function(k, v) {
  	if (k != "") {
  		this._keys.push(k);
  		this._map["="+k] = this._vals.length;
  		this._vals.push(v);
  	}
  }
  
  Hash.prototype.replace = function(k, k2, v) {
  	if (k == k2) return;
  
  	var offset = this._map["="+k];
  	this._keys[offset] = k2;
  	if (typeof v != "undefined") this._vals[offset] = v;
  	this._map["="+k2] = offset;
  	delete(this._map["="+k]);
  }
  
  Hash.prototype.drop = function(k) {
  	if (k != "") {
  		var offset = this._map["="+k];
  		this._keys.splice(offset, 1);
  		this._vals.splice(offset, 1);
  		delete(this._map["="+k]);
  		for (var p in this._map) {
  			if (this._map[p] >= offset) this._map[p]--;
  		}
  		if (this._cursor >= offset && this._cursor > 0) this._cursor--;
  	}
  }
  
  Hash.prototype.get = function(k) {
  	if (k != "") {
  		return this._vals[this._map["="+k]];
  	}
  }
  
  Hash.prototype.keys = function() {
  	return this._keys;
  }
  
  Hash.prototype.hasKey = function(k) {
  	if (k != "") {
  		return (typeof this._map["="+k] != "undefined");
  	}
  }
  
  Hash.prototype.values = function() {
  	return this._vals;
  }
  
  Hash.prototype.reset = function() {
  	this._cursor = 0;
  }
  
  Hash.prototype.first = function() {
  	this.reset();
  	return this.next();
  }
  
  Hash.prototype.next = function() {
  	if (this._cursor++ < this._keys.length)
  		return {key: this._keys[this._cursor-1], value: this._vals[this._cursor-1]};
  }