You could try.
<FORM action="prog.php" method="post">
item 1 <input type="checkbox" name="item[]" value="12345">
item 2 <input type="checkbox" name="item[]" value="12346">
item 3 <input type="checkbox" name="item[]" value="12347">
item 4 <input type="checkbox" name="item[]" value="12348">
<INPUT type="submit" value="submit">
</FORM>
the php would look like.
<?
$howmany=count($item);
while ( $howmany >= 0 )
{
if ( $item[$howmany] != "" )
{
echo "item number : ".$item[$howmany]."<BR>";
}
}
?>
It will let you check as many boxes as you like and the items numbers will be stored in the array item.