undefined field(value) in database.

[punex]

heloo. i created checkboxes in my web interface and each time a checbox is ticked the value is stored in database but however the checboxes which is not selected , the value is stored as Undefined in database. where did i do wrong? here is my coding for the checkbox:

<table width="689" height="41">
<tr>
 <span style="background-color:#FFCCCC">Festival Celebrated : </span>
 <div align ="left"> <br>
 <!-- <table width="689" height="10"> -->
 <tr>
 <% temp_field = String(rs.fields(12).Name); %>
 <input type ="checkbox" name = <% = temp_field %> value ="Chinese New Year"> Chinese New Year<br>  </tr>

 <tr>
 <% temp_field = String(rs.fields(13).Name); %>
 <input type ="checkbox" name = <% = temp_field %> value ="Hari Raya"> Hari Raya<br> </tr>

 <tr>
 <% temp_field = String(rs.fields(14).Name); %>
 <input type ="checkbox" name = <% = temp_field %> value ="Deepavali"> Deepavali <br>

 <tr>
  <% temp_field = String(rs.fields(15).Name); %>
 <input type ="checkbox" name = <% = temp_field %> value ="Christmas"> Christmas <br>

 <br>
 </div> </table>