Voting system with jQuery, Ajax and PHP works only local server

Question

I am a no good in PHP (just learning). I tried modifying a php voting script which I downloaded from a free source. i can add image though (it was not an easy task for me and I am not done yet). Now Voting works fine on my local server , but online it doesn't. If I click to vote, the numbers just disappear without return. below are the codes to look into.

index.php ---

<?php include('config.php'); 

$sql=mysql_query("SELECT * FROM messages ORDER BY `messages`.`up` DESC LIMIT 20"); 

while($row=mysql_fetch_array($sql)) { $title=$row['title']; $desc=$row['desc']; 

$mes_id=$row['mes_id']; $image=$row['image']; $up=$row['up']; 

$down=$row['down']; ?> <div id="vote"> <div class="box1"> 
<div class='up'><a href="" class="vote" id="<?php echo $mes_id; ?>" name="up"> 
<?php echo $up; ?></a></div> 

<div class='down'><a href="" class="vote" id="<?php echo $mes_id; ?>" name="down">
<?php echo $down; ?></a></div></div> 

<div class='image' ><?php echo "<img src=user/admin/".$image ." width='87%' height='70%'/>"?></div> 

<div class ='title'><?php echo $title; ?></div> 

<div class='box2' > 
<?php echo $desc; ?> </div> </div> 

<?php } ?>

up_vote.php --------------------------

<?php include("config.php"); 

$ip=$_SERVER['REMOTE_ADDR']; 
if($_POST['id']) { $id=$_POST['id']; $id = mysql_real_escape_String($id); $ip_sql=mysql_query("SELECT ip_add FROM voting_ip WHERE mes_id_fk='$id' AND ip_add='$ip'"); 

$count=mysql_num_rows($ip_sql)or die(mysql_error()); 
if($count<=20) 
{ 
$sql = "UPDATE messages SET up=up+1 WHERE mes_id='$id'"; mysql_query( $up); 
$sql_in = "INSERT INTO messages (mes_id_fk,ip_add) VALUES ('$id','$ip')"; mysql_query( $sql_in); 
} else 
{ echo "<script>alert('You have already voted');</script>"; } 
$result=mysql_query("SELECT up FROM messages WHERE mes_id='$id'"); 
$row=mysql_fetch_array($result); $up_value=$row['up']; echo $up_value; } ?> 

down_vote.php -----------------------------

<?php include("config.php"); 

$ip=$_SERVER['REMOTE_ADDR']; 
if($_POST['id']) { $id=$_POST['id']; 
$id = mysql_real_escape_String($id);

 $ip_sql=mysql_query("SELECT ip_add FROM voting_ip WHERE mes_id_fk='$id' AND ip_add='$ip'"); 

$count=mysql_num_rows($ip_sql) or die(mysql_error());
 if($count<=0)

 { $sql = "UPDATE Messages SET down=down+1 WHERE mes_id='$id'"; mysql_query( $sql); 
$sql_in = "INSERT INTO voting_ip (mes_id_fk,ip_add) values ('$id','$ip')"; mysql_query( $sql_in); 
} else { echo "<script>alert('You have already voted');</script>"; } 

$result=mysql_query("SELECT down FROM Messages WHERE mes_id='$id'"); 
$row=mysql_fetch_array($result); 
$down_value=$row['down']; echo $down_value; } 
?>

Javascript --------------------------- (this is at the index header with some HTML codes)

<script type="text/javascript">
$(function() {

$(".vote").click(function() 
{

var id = $(this).attr("id");
var name = $(this).attr("name");
var dataString = 'id='+ id ;
var parent = $(this);


if(name=='up')
{

$(this).fadeIn(200).html('<img src="dot.gif" align="absmiddle">');
$.ajax({
   type: "POST",
   url: "up_vote.php",
   data: dataString,
   cache: false,

   success: function(html)
   {
    parent.html(html);

  }  });

}
else
{

$(this).fadeIn(200).html('<img src="dot.gif" align="absmiddle">');
$.ajax({
   type: "POST",
   url: "down_vote.php",
   data: dataString,
   cache: false,

   success: function(html)
   {
       parent.html(html);
  }

 });


}


return false;
    });

});
</script>

I appreciate anyone helping out, thanks everyone.

Answer 1

From your code,

if($count==50)

then only the values are being updated!!. How is it possible for a person who is going to vote for the first time??? It should be

if($count<50)