jQuery floating header on scroll

gistfile1.js

jQuery(document).ready(function($){
	var showed = false;
	function floating_header() {
		if ( $(window).width() > 700 ) {
			window_scroll = $(this).scrollTop();
			if ( window_scroll > 220 ) {
				if ( showed == false ) {
					$('#floating-header').slideDown('fast');
					//alert('show');
				}
				showed = true;
			} else {
				if ( showed == true) {
					$('#floating-header').slideUp('fast');
					//alert('hide');	
				}
				showed = false;		
			}
		}
	}
	$(window).scroll(floating_header);
	floating_header();
});