大家帮忙看看为什么我的checkinformation（）函数不能被触发？急急急！
<?php
if(!empty($_POST["btnsubmit"])){
$link=mysql_connect("localhost","root","123456789") or die(mysql_error());
mysql_select_db(member,$link);
$sql="insert into stu_information values({$_POST['num']},\"{$_POST['name']}\",\"{$_POST['sex']}\",\"{$_POST['birthday']}\",\"{$_POST['major']}\",\"{$_POST['class']}\",\"{$_POST['check']}\",\"{$_POST['email']}\")";
$rs=mysql_query($sql,$link) or die(mysql_error());
$sn=mysql_affected_rows($link);
$msg=($sn==1)? "添加记录成功！":"添加记录失败！";
}?>
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档 </title>
<script language="javascript">
<!--
function check(){
if(form1.num.value==""){
alert("学号不能为空，请输入学号！");
form1.num.focus();
&
<script>
with(document)
{
for(var i=0;i <streams.length;i++)
writeln(" <p> <a href=# onclick=change(streams[i].url)>"+streams[i].name+" </a> < ......
