#mn h4.about_me { 
	background: transparent url(../images/mn_01_01.gif) no-repeat top left; 
	width: 53px;
	height: 16px;
	display: block;
}
#mn h4.about_me a:hover {
	background: transparent url(../images/mn_01_01_o.gif) no-repeat top left; 
	width: 53px;
	height: 16px;
}