How can i allow a user to select only 2checkboxes, if they choose more then 2an error message will appear saying you can only select 2, heres my code below where the checkboxes are used.

// Loop through data and display

while($a_row = mysql_fetch_assoc($result))
echo "<tr>".
	'<td style="color: black;"><input type="checkbox" name="bookings[]" value="'.$a_row['id'].'"></td>'.
	"<td style=\"color:Black\">".$a_row['Bookingdate']."</td>".
	"<td style=\"color:Black\">".$a_row['DayofWeek']."</td>".
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