Ajax :: Post The Value Of Checkbox In Call?

i retrieved data from mysql table into html page i.e

Code:
$query="select * from student";
$result=mysql_query($query)or die(mysql_error());
while($rs=mysql_fetch_array($result))
{
?>

[Code]...

assume that checkbox of id 1 is checked and retrieved from mysql table.<br /> Now what i want to do is that when i checked the remaing two checkbox into this table and a function is called to ajax which goes to php page and update the value of checked field according to the given id (i.e 2 and 3 in this case). Not refreshing the whole page nor updating the whole record just the value of check box.<br/> i am new to ajax so