How to UPDATE?

[diela mohd]

Hi,
dear friends..i've already try to check the coding and it seems doesn't have any problem with it..
can u suggest a solution why this coding can't use to update the database?? everytime i click the button, the dialog box contains 'failed to update' exist...

<?php

$db="projek"; //database name
$table="projek"; //table name

$con=mysql_connect("localhost","root","");
mysql_select_db($db,$con);

$id_projek=$_POST['id_projek'];
$homepage=$_POST['homepage'];
$project_name=$_POST['project_name'];
$desc=$_POST['desc'];
$day=$_POST['day'];
$month=$_POST['month'];
$year=$_POST['year'];
$status=$_POST['status'];
$email=$_POST['email'];


$q= "UPDATE $table SET id_projek='$id_projek', homepage='$homepage', project_name ='$project_name',desc ='$desc', day ='$day',month='$month', year ='$year', status ='$status', email ='$email' WHERE id_projek='$id_projek' ";

$rslt=mysql_query($q);
$numrow=mysql_affected_rows();

if ($numrow>0)
{
echo "<script>alert('..::UPDATE RECORD::..');<//script>";
include 'list_projek.php';
}
else
{
echo "<script>alert('..::!FAILED TO UPDATE!::..');</script>";
include 'list_projek.php';
}

?>