.sl_ctr{
    position: relative;
    width: 100%;
    height: 420px;
    overflow: hidden;
}
.sldr{
position:relative;
width:10000px;
height:300px;
}
.sldr img{
float:left;
}
.prv_b, .nxt_b{
position:absolute;
top:135px;
display:block;
width:35px;
height:35px;
cursor:pointer;
}
.prv_b:hover, .nxt_b:hover{opacity:.6;}
.prv_b{
left:10px;
background:url(../images/slider/prv.png) no-repeat;
}
.nxt_b{
right:10px;
background:url(../images/slider/nxt.png) no-repeat;
}