*{ margin:0; padding:0; list-style:none;}
.lrtk{ width:100%; height:450px; margin:0 auto; overflow:hidden; display:none; background:url(img/big_1.png) no-repeat center top #1F7EFE; text-align:center; position:relative;}
.lrtk .link{ width:100%; height:450px; display:block; z-index:10;}
.lrtk .up{ display:block; width:120px; height:24px; background:url(img/arrow_1.png) no-repeat left bottom; position:absolute; left:50%; bottom:0; z-index:20; margin-left:-60px;}
.lrtk .down{ display:block; width:120px; height:24px; background:url(img/arrow_1.png) no-repeat left top; position:absolute; left:50%; top:36px; z-index:20; margin-left:-60px;}