#c { position: relative; }
#a { position: absolute; left: 0; top: 0; font-size: 12px; font-family: 宋体; }
#b { position: absolute; left: 0; top: 0; font-size: 12px; font-family: 宋体; -moz-opacity:0;opacity: 0;filter: alpha(opacity=0); }
[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]
