Some help needed

Ok, so I am creating a like system like the one on youtube. I have a problem, the code is not working, I do not know what I am doing wrong since I don't get any errors and I am stuck like this for 2 days now.

<?php
echo "<a href='{$_SERVER['PHP_SELF']}?vot=up&idpost=$idpost'";
?>
onclick="return confirm('Multumim pentru votul pozitiv!')"
<?php
echo'><img src="images/up.png" alt="Vote UP" /></a>';
?> <?php
echo "<a href='{$_SERVER['PHP_SELF']}?vot=down&idpost=$idpost'";
?>
onclick="return confirm('Ne pare rau ca nu ti-a placut acest post!')"
<?php
echo'><img src="images/down.png" alt="Vote DOWN" /></a>';

if(!isset($_GET['vot'])) $_GET['vot'] = '';

switch($_GET['vot'])
{
case '':
echo '';
break;

case 'up':

$query12="SELECT idlike, up, down, idpost FROM like INNER JOIN posts ON like.idpost=posts.idpost WHERE idpost=$idpost";
$result12 = mysql_query($query12);
if ($row=mysql_fetch_assoc($result12))
{
//UPDATE
$increment = $row['up']+1;
$query13 = "UPDATE like SET up=$increment WHERE idpost=$idpost";
$result13 = mysql_query($query13);
}
else
{
//INSERT
$implicit=1;
$query21 = "INSERT INTO like (idlike, idpost, up) VALUES ('', '$idpost', '$implicit')";
$result21 = mysql_query($query21);
}

break;

case 'down':

$query14="SELECT idlike, up, down, idpost FROM like INNER JOIN posts ON like.idpost=posts.idpost WHERE idpost=$idpost";
$result14 = mysql_query($query14);
if ($row=mysql_fetch_assoc($result14))
{
//UPDATE
$increment2 = $row['down']+1;
$query15 = "UPDATE like SET down=$increment2 WHERE idpost=$idpost";
$result15 = mysql_query($query15);
}
else
{
//INSERT
$implicit2=1;
$query22 = "INSERT INTO like (idlike, idpost, down) VALUES ('', '$idpost', '$implicit2')";
$result22 = mysql_query($query22);
}

break;
}
?>

PHP:

Thanks in advance!

 

i have developed somthing like this but im not sharing the script . Instead u can use it for free :

http://www.votemyweb.com/

Code (markup):

 

Thanks but I can't use it because it is for my end of the university degree project.