表单元素多选择

<form action="" method="post" name="myform">
<p>课程选择：
       <input name="course1" type="checkbox" value="C#" />C# &nbsp;&nbsp;
       <input name="course2" type="checkbox" value="JavaScript" checked="checked"/>JavaScript &nbsp;&nbsp;
       <input name="course3" type="checkbox" value="HTML" />HTML &nbsp;&nbsp;
       <input name="course4" type="checkbox" value="Flash"  checked="checked"/>Flash
</p>
</form>