$(document).ready(function() {
	$('select.showdd').change(function() {
		// if querystring exists
		if (window.location.href.indexOf('?') != -1) {
			// if not default show
			if (window.location.href.indexOf('show=') == -1) {
				window.location.href = window.location.href + '&show=' + $(this).val();
			} else {
				window.location.href = window.location.href.replace(/show=\d+/, 'show=' + $(this).val());
			}
		} else {
			window.location.href = window.location.href + '?show=' + $(this).val();
		}
	});
});