Can't get background image or color in nav to show up in ie7

Can't get the background image or color to show in #nav nor the background image in #nav ul. Works in FF3 and IE8, but not IE7:


#nav {
	background: #e4f2fd url("../img/nav-left-bg.png") no-repeat left;
	height: 34px;
	float: right;
	position: relative;
	margin-top: 4.5em;
	z-index: 1000;
#nav ul {
	float: left;
	list-style: none;
	background: url("../img/nav-right-bg.png") no-repeat right;
	height: 34px;
	padding-right: 0.5em;
	margin: 0 0 0 1em;
#nav ul li {
	display: inline;
#nav ul li a {
	display: block;
	float: left;
	padding: 3px;

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