#slider{ width:690px; margin:0 auto; }	
#slider ul, #slider li.slides{
	margin:0;
	padding:0;
	list-style:none;
	float:left;
	width:680px;
}
#slider li.slides{ 
	width:680px;
}	
#prevBtn, #nextBtn{ 
	display:block;
	width:17px;
	height:51px;
	position:absolute;
	top:50%;
	margin-top:-26px;
}	
#nextBtn{
	right:-15px;
}
#prevBtn{
	left:-15px;
}													
#prevBtn a, #nextBtn a{  
	display:block;
	width:17px;
	height:51px;
	background:url(../images/port-left.jpg) no-repeat 0 0;
	outline:none;
}	
#nextBtn a{ 
	background:url(../images/port-right.jpg) no-repeat 0 0;	
}