.li_slider {
	margin:0;
	padding:0;
	height:50px;
	width:558px;
	float:left;
	list-style:none;
}

.ul_slider {
	margin:0;
	padding:0;
	width:558px;
	height:50px;
	overflow:hidden; 
}

span#prevBtn{}
span#nextBtn{}