为什么我的网页中嵌入百度搜索窗口会出现乱码？

我在我的网页中加入了http://www.baidu.com/search/freecode.html中的代码，但是我选择搜索“新闻”那个就会出现搜索乱码，是不是编码的问题，应该怎么解决，下面是我的源代码<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <meta charset="gbk">
</head>
<body><SCRIPT language=javascript>
    function gowhere1(formname) {
        var url;
        if (formname.myselectvalue.value == "0") {
            url = "http://www.baidu.com/baidu";
            document.search_form1.tn.value = "baidu";
            formname.method = "get";
        }
        if (formname.myselectvalue.value == "1") {
            url = "http://mp3.baidu.com/m";
            document.search_form1.tn.value = "baidump3";
            document.search_form1.ct.value = "134217728";
            document.search_form1.lm.value = "-1";
        }        if (formname.myselectvalue.value == "4") {
            document.search_form1.tn.value = "news";
            document.search_form1.cl.value = "2";
            document.search_form1.rn.value = "20";
            url = "http://news.baidu.com/ns";
        }
        if (formname.myselectvalue.value == "5") {
            document.search_form1.tn.value = "baiduiamge";
            document.search_form1.ct.value = "201326592";
            document.search_form1.cl.value = "2";
            document.search_form1.lm.value = "-1";
            url = "http://image.baidu.com/i";
        }
        if (formname.myselectvalue.value == "6") {
            url = "http://post.baidu.com/f";
            document.search_form1.tn.value = "baiduPostSearch";
            document.search_form1.ct.value = "352321536";
            document.search_form1.rn.value = "10";
            document.search_form1.lm.value = "65536";
        }        formname.action = url;
        return true;
    }
</SCRIPT>
<form name="search_form1" target="_blank" onsubmit="return gowhere1(this)">
<table width="460" height="60" border="0" bgcolor="#FFFFFF" cellpadding="0" cellspacing="0" style=font-family:宋体><tr><td>
<TABLE width="460" height="80" border=0 cellPadding=0 cellSpacing=0>
      <INPUT name=myselectvalue type=hidden value=0>
      <INPUT name=tn type=hidden>
      <INPUT name=ct type=hidden>
      <INPUT name=lm type=hidden>
      <INPUT name=cl type=hidden>
      <INPUT name=rn type=hidden>
      <TR>
                  <TD width="8%" valign="bottom">
                    <DIV align=center><a href="http://www.baidu.com/"><img src="http://img.baidu.com/img/logo-80px.gif"
alt="Baidu" align="bottom" border="0"></a></DIV></TD>
    <TD vAlign=bottom width="92%">
<INPUT name=myselect onclick=javascript:this.form.myselectvalue.value=4; type=radio value=0>
                    <FONT color=#0000cc style="FONT-SIZE: 12px">新闻</FONT>                   <INPUT CHECKED name=myselect onclick=javascript:this.form.myselectvalue.value=0; type=radio value=0>
                    <SPAN class=f12><FONT color=#0000cc style="FONT-SIZE: 12px">网页</FONT></SPAN>
                    <INPUT name=myselect onclick=javascript:this.form.myselectvalue.value=1; type=radio value=1>
                    <SPAN class=f12><FONT color=#0000cc style="FONT-SIZE: 12px">mp3</FONT></SPAN>
<INPUT name=myselect onclick=javascript:this.form.myselectvalue.value=6; type=radio value=0>
<FONT color=#0000cc style="FONT-SIZE: 12px">贴吧</FONT>
<INPUT name=myselect onclick=javascript:this.form.myselectvalue.value=5; type=radio value=0>
                    <FONT color=#0000cc style="FONT-SIZE: 12px">图片</FONT>                    <TABLE align=right border=0 cellPadding=0 cellSpacing=0 width="100%">
                      <TBODY>
                        <TR>
                          <TD><FONT style="FONT-SIZE: 12px">
                            <input id=word name=word size="40">
                            </FONT> <input type="submit" value="百度搜索"> </TD></TR>       </form></body>
</html>