.box{padding:10px; background:gray;}
.fix{*zoom:1;}
.fix:after{display:block; content:"clear"; height:0; clear:both; overflow:hidden; visibility:hidden;}
.l{float:left;} <div class="box fix">
<img class="l" src="http://image.zhangxinxu.com/image/study/s/s256/mm1.jpg" />
</div>