css display:inline-block兼容ie6及火狐

<style>
    .box{width: 400px;height: 200px;background-color: #e4f1fb;overflow: hidden;}
    .nav{display: inline-block;*display: inline;zoom: 1;}
</style>
<div class="box">
    <div class="nav">11111</div>
    <div class="nav">22222</div>
</div>