请各位大虾，帮我看看，源代码如下：
<!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>
<style type="text/css">
<!--
.STYLE1 {font-size: 36px}
.STYLE2 {font-size: 24px}
-->
</style>
</head>
<body>
<p> </p>
<p class="STYLE1"> </p>
<?php if(!isset($_POST["btnSubmit"])) { ?>
<form id="form1" name="form1" method="post" action="">
<p class="STYLE1"> Web 开发技术与开发工具 </p>
<hr />
<p> <span class="STYLE1"> </span> </p>
<p> </p>
<p> <span class="STYLE1"> <span class="STYLE2">技术： </span>
<label>
<select name="1stWebTech" id="1stWebTech">
<o
