function Slideshow(options) {

		// The defaults, if user didn't provide values
		var defaults = {
			openSpeed : 1000,
			closeSpeed : 1000,
			animationFunction : "linear",
			matt: "bob"
		};

		// Function that takes options as does something with it
		function init(options) {
			console.info(options);
		}

		// Takes user proivded
		function combine_options(options) {
			for ( option in defaults ) {
				if ( typeof options[option] == "undefined" ) {
					options[option] = defaults[option]
				}
			} return options;
		}

		init(combine_options(options));

	}

	var my_slideshow = new Slideshow({
		openSpeed: 2000
	});