将以下代码放到<body>中就可以了：
<!-- SiteSearch Google -->
<FORM method=GET action="http://www.google.com/search">
<INPUT TYPE=hidden name=ie value=GB2312>
<INPUT TYPE=hidden name=oe value=GB2312>
<INPUT TYPE=hidden name="hl" value="zh-CN">
<TABLE bgcolor="#FFFFFF"><tr><td>
<A HREF="http://www.google.com/">
<IMG SRC="http://www.google.com/logos/Logo_40wht.gif"
border="0" ALT="Google"></A>
</td>
<td>
<INPUT TYPE=text name=q size=31 maxlength=255 value="">
<INPUT TYPE=submit name=btnG VALUE="Google Search">
<font size=-1>
<INPUT TYPE=hidden name=domains value="YOUR DOMAIN NAME"><br>
<INPUT TYPE=radio name=sitesearch value=""> 搜索WWW
<INPUT TYPE=radio name=sitesearch value="YOUR DOMAIN NAME" checked> 搜索YOUR DOMAIN NAME <br>
</font>
</td></tr></TABLE>
</FORM>
<!-- SiteSearch Google -->
<FORM method=GET action="http://www.google.com/search">
<INPUT TYPE=hidden name=ie value=GB2312>
<INPUT TYPE=hidden name=oe value=GB2312>
<INPUT TYPE=hidden name="hl" value="zh-CN">
<TABLE bgcolor="#FFFFFF"><tr><td>
<A HREF="http://www.google.com/">
<IMG SRC="http://www.google.com/logos/Logo_40wht.gif"
border="0" ALT="Google"></A>
</td>
<td>
<INPUT TYPE=text name=q size=31 maxlength=255 value="">
<INPUT TYPE=submit name=btnG VALUE="Google Search">
<font size=-1>
<INPUT TYPE=hidden name=domains value="YOUR DOMAIN NAME"><br>
<INPUT TYPE=radio name=sitesearch value=""> 搜索WWW
<INPUT TYPE=radio name=sitesearch value="YOUR DOMAIN NAME" checked> 搜索YOUR DOMAIN NAME <br>
</font>
</td></tr></TABLE>
</FORM>
<!-- SiteSearch Google -->