hello i try to put img for my nav bar but it doesnt work..

heres my code in css:
@charset "utf-8";
/* CSS Document */

body {
	background: url('../img/bg.PNG') bottom center no-repeat;
html {
	background: url('../img/bg.PNG') top center no-repeat;
#navigation {
	background-image:url('../img/nav.PNG') no-repeat;
	width: 666px;
	height: 56px;
the image route is correct and i dont know whats the problem why the image doesnt show..