leave is a mysql statement. try putting backticks around it.
$sqlquery = "insert into `leave` (session_id,empid,`leave`,year) values('$_SESSION[id]', '$_SESSION[empid]', '$_POST[leavenum]', '$_POST[year]')";
$res = mysql_query($sqlquery,$link) or die('Error: ' . mysql_error());
pritaeas
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