#slideshow{width:964px; margin:0 auto}

#slideshow ul{list-style-type:none; height:1%}

#slideshow ul:after{content:"."; clear:both; display:block; height:0; visibility:hidden}
 
#slideshow .slides{overflow:hidden; height:290px}

#slideshow .slides ul{height:290px}

#slideshow .slides li{height:290px; margin:0 auto; width:964px; float:left}