html - php script not working in Internet explorer and Firefox -


i have button on webpage allows users add video on page list of favourites. behind button form , php. php code uses session variable retrieve username. information used relevant user id database , store value in variable. using input value form possible retrieve tuple videos database table related video in question , store values of video title , url attributes in variables. code checks if user has added video “favourite”. favourites database entity checked tuples containing both user id , video id. if both contained in single row of database table user has added video , notified of this. otherwise, user id, video id, video title , url inserted favourites database entity , user informed video has been added works fine in chrome or safari nothing in ie or firefox. database updated , message displayed in chrome , safari. i've attached code, please note session has been started in earlier code on webpage. assistance appreciated.

    <div id="addfav">     <form action="python.php" method="post">         <input name="add" src="images/add.png" type="image"         value="3">     </form>     <?php          $user=$_session['user'];          if ( isset( $_post['add'] ) )         {             $vid = $_post["add"];             $sql = "select * `users` username = '$user'";             $result = mysql_query($sql) or die(mysql_error());             $row = mysql_fetch_array($result);             $uid= $row['user_id'];              $sql = "select * `video` video_id = '$vid'";             $result = mysql_query($sql) or die(mysql_error());             $row = mysql_fetch_array($result);             $url=$row['url'];             $title=$row['title'];              $check = mysql_query("select * `favourites` uid = '$uid' , vid_id = '$vid'") or die (mysql_error());             $r = mysql_num_rows($check);              if ($r>=1)             {                 echo "already added favourites";                  echo '<script type="text/javascript">window.alert("already added favourites")</script>';                 //'<span style="color: red;" />already added favourites </span>' ;                }              else              {                   mysql_query("insert `favourites` (`uid`,                 `vid_id`,`url`,`title`) values ('$uid',                 '$vid','$url','$title')")or die(mysql_error());                 echo "added favourites";              }         }     ?> </div>

(just debug idea) try change input image hidden element : 

<form action="python.php" method="post">      <!-- don't remove this, keep image shown-->      <input name="addimg" src="images/add.png" type="image"  value="3">       <input type='hidden' name='add' value='3' />  </form>

does works now?


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