function Hash() {
	this.length = 0;
	this.items = new Array();
	for (var i = 0; i < arguments.length; i += 2) {
		if (typeof (arguments[i + 1]) != 'undefined') {
			this.items[arguments[i]] = arguments[i + 1];
			this.length++;
		}
	}

	this.removeItem = function(in_key) {
		var tmp_previous;
		if (typeof (this.items[in_key]) != 'undefined') {
			this.length--;
			var tmp_previous = this.items[in_key];
			delete this.items[in_key];
		}

		return tmp_previous;
	}

	this.getItem = function(in_key) {
		return this.items[in_key];
	}

	this.setItem = function(in_key, in_value) {
		var tmp_previous;
		if (typeof (in_value) != 'undefined') {
			if (typeof (this.items[in_key]) == 'undefined') {
				this.length++;
			}
			else {
				tmp_previous = this.items[in_key];
			}

			this.items[in_key] = in_value;
		}

		return tmp_previous;
	}

	this.hasItem = function(in_key) {
		return typeof (this.items[in_key]) != 'undefined';
	}

	this.clear = function() {
		for (var i in this.items) {
			delete this.items[i];
		}

		this.length = 0;
	}
}