Replace:
#site-header {
	background: transparent url("img/bg/inqy.jpg") no-repeat top left;
	width: 1000px;
	height: 167px;
	
	margin: 0;
	padding: 0;
	
	clear: both;
}

With:
#site-header {
	background: transparent url("img/bg/inqy.jpg") no-repeat top left;
	width: 1000px;
	height: 167px;
	
	text-decoration: none;
	text-indent: -100em;
	display: block;

	margin: 0;
	padding: 0;
	
	clear: both;
}