$(".con").eq(0).show();
  $(".btn span").click(function(){
    var num =$(".btn span").index(this);
    $(".con").hide();
    $(".con").eq(num).show().slblings().hide();
  })

body { cursor:default; -webkit-text-size-adjust:none; font-size:12px; font-family:Arial; background:#FFF; }
.clear { zoom:1; }
.clear:after { visibility:hidden; display:block; font-size:0; content:"1"; clear:both; height:0; }
.main { width:500px; margin:20px auto; }
.btn span { width:35px; text-align:center; color:#fff; background:#f00; cursor:pointer; margin:0 5px; display:block; float:left; }
.con { display:none; border:#033 1px solid; height:100px; width:200px; }

<div class="main">
 <div class="btn clear"><span>1</span><span>2</span><span>3</span></div>
 <div class="con">第一个<br /> </div>
 <div class="con">第二个<br /> </div>
 <div class="con">第三个<br /> </div>
</div>