How do I make checkboxes sticky?

[Goldmund]

Here is a small section of my code where I want to have sticky checkboxes. If I use the method below, Every checkbox is checked when just one of the boxes is checked.
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...<tr valign=top><td width=10><input type=checkbox name="living[]" value="Alone"';
if ($_POST['living'] = 'Alone') {
echo 'checked="checked"'; } print ' >
</td><td width="206">Alone</td>
<td width="20"><input type=checkbox name="living[]" value="With kids"';
if ($_POST['living'] = 'Kids') {
echo 'checked="checked"'; } print ' >
</td><td>With kids</td></tr>...
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How do I make checkboxes stick? Thanks!
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[TRUSTAbyss]

I think you need to add a readonly attribute to the input tags.