<form name='frm' action='nextpage.asp'>
<input type="checkbox" name="chkbox" onclick="showhidefield()">
Check/uncheck here to show/hide the other form fields
<br>
<div id='hideablearea' style='visibility:hidden;'>
<input type='text'><br>
<input type='submit'>
</div>
This is a text line below the hideable form fields.<br>
</form>