表单未传递整个字段值

This is my form

这是我的表格

<form name='manual' method='POST' action='manual.php' onsubmit=\"return validateForm()\">

<input type='hidden' name = 'serial_no' value=2 > 

<input type='hidden' name = 'batch' value='' > 

<input type='hidden' name = 'course' value='' >

<input type='hidden' name = 'schedule_id' value=''>

<input type='text'  id='topic' name = 'topic'> 

<input type='text' id='start_date' name = 'start_date' >

<input type='text'  id='end_date' onclick=\"cal();\" name='end_date'>

<input type='submit' name = 'Add'  value='Add'> 

</form>
<form name='manual'