How to make checkbox option enable/disable

Hello,

i am newbie in coldfusion...i want to make an option answer after my first check box answer is true

code :

<tr>

    <td><table width="100%"  border="0">

  <tr>

<tr>

    <td>Do you have a car? </td>

    <td><input name="car_type" type="checkbox" value="1">Yes<input name="car_type" type="checkbox" value="0">No</td>

</tr>

<tr>

    <td width="100%"></td>

    <td><strong>(Select your car type)</strong></td>

</tr>

  <tr>

    <td></td>

    <td><input name="car_bmw" type="checkbox" value="1">

      BMW</td></tr>

   <tr><td></td>

    <td><input name="car_mercedes" type="checkbox" value="1">

      Mercedes</td></tr>

    <td></td>

    <td><input name="car_toyota" type="checkbox" value="1">

      Toyota</td>

     <td></td>

    <tr><td>

    </td><td>Others<input name="car_others" type="text" size="20" maxlength="100" /></td>   

  </tr>

  <tr>

Thank u