how to use echo checkboxes in php when i don't have access to $_POST

[Negin Nickparsa <nickparsa@xxxxxxxxx>]

because I echo the checkboxes like this:

if($num>0)
{
echo "<table border=2>";
for($i=0;$i<$num;$i++)
{
$row=mysql_fetch_row($result);
echo "<tr>";
echo"<td><input type='Checkbox' name='p$i'  value='yes' unchecked /></td>";
echo"<td>$row[0]</td>";
 echo"</tr>";
}//for
echo"</table>";
}//if

i can't use $_POST because it's not in html
how can i insert my items that are checked into table?