<form action="http://www.baidu.com/baidu" target="_blank">
<div align="center">
<input name=tn type=hidden value=http://www.mamicode.com/baidu>
<a href="http://www.baidu.com/">
<img src="http://img.baidu.com/search/img/baidulogo_clarity_80_29.gif" alt="Baidu" align="bottom" border="0"></a>
<input type=text name=word size=30>
<input type="submit" value="http://www.mamicode.com/百度搜索"></div>
</form>

搜索引擎的调用