how can i change the checkbox to disabled after the user choose the checkbox?

I want to make a cinema seats buying system. This is a homework, so i don't have a sever to run this project.

i want to try to use another document (for example:MS access database) to collect the result,but i have no idea how can i make it.

how can i change the checkbox to disabled after the user choose the checkbox? here is my checkbox form

<form>  
<ol class="seats" type="A">
    <li class="seat">
      <input type="checkbox" id="1A" />
      <label for="1A">1A</label>
    </li>
    <li class="seat">
      <input type="checkbox" id="1B" />
      <label for="1B">1B</label>
    </li>
    <li class="seat">
      <input type="checkbox" id="1C" />
      <label for="1C">1C</label>
    </li>
    <li class="seat">
      <input type="checkbox" id="1D" />
      <label for="1D">1D</label>
    </li>
    <li class="seat">
      <input type="checkbox"  disabled id="1E" />
      <label for="1E">Occupied</label>
    </li>
    <li class="seat">
      <input type="checkbox" id="1F" />
      <label for="1F">1F</label>
    </li>
    <li class="seat">
      <input type="checkbox" id="1G" />
      <label for="1G">1G</label>
    </li>
    <li class="seat">
      <input type="checkbox" id="1H" />
      <label for="1H">1H</label>
    </li>
  </ol>
</form>