意见反馈的代码是什么

<script language="JavaScript">
<!--
function validate_form() {
validity = true;
if (!check_empty(document.form.NAME.value))
{ validity = false; alert('对不起!请你填入你的姓名。'); }
if (!check_email(document.form.EMAIL.value))
{ validity = false; alert('对不起!请重新正确填入Email地址。'); }
if (!check_empty(document.form.DESCRIPTION.value))
{ validity = false; alert('对不起!请你在"简要描述"留言填入留言。'); }
if (validity)
alert (" 谢谢你的来信. "
+ " 你所填的信息将以Email形式发送给我， "
+ " 假如你认为本站内容不错的话，请将本 "
+ " 介绍给你的朋友，希望大家经常光顾本站。");
return validity;
}

function check_empty(text) {
return (text.length > 0);
}

function check_email(address) {
if ((address == "")
|| (address.indexOf ('@') == -1)
|| (address.indexOf ('.') == -1))
return false;
return true;
}

// -->
</script>
<form name="form" method="post" action="mailto:ningadmin@163.com"
enctype="text/plain" onSubmit="return validate_form()">
<table width="90%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="77%">
<div align="left">
<table border="1" width="69%" bordercolorlight="#008000" cellspacing="0" cellpadding="5" bordercolordark="#FFFFFF">
<tr>
<td width="21%" align="right"><font size="3">姓&nbsp;
名:</font>
</td>
<td width="79%">
<input type="text" size=25 name="NAME">
</td>
</tr>
<tr>
<td width="21%" align="right"><font size="3">E-mail:&nbsp; </font></td>
<td width="79%">
<input type="text" size=33 name="EMAIL">
</td>
</tr>
<tr>
<td width="21%" align="right"><font size="3">主&nbsp;
页</font><font size="3">: </font></td>
<td width="79%">
<input type="text" size=46 name="URL" value="http://">
</td>
</tr>
<tr>
<td width="21%" align="right"><font size="3">留&nbsp;
言:</font></td>
<td width="79%">
<textarea name="DESCRIPTION" rows=8 cols=45 wrap=virtual></textarea>
</td>
</tr>
<tr>
<td width="21%" align="right">　</td>
<td width="79%">
<input type="submit" name="submit" value="发送"><input type="reset" value="清除" name="reset">
</td>
</tr>
</table>
</div>
</td>
</tr>
</table>
</form>