Si quello che mi hai detto lo fatto effetivamente il nome era sempre uguale, ma pero il mio script non funziona ancora, adesso per semplificare ho tolto tutti i controlli:

Codice PHP:
<?php 
$numberfile = $_POST['uploadfile']; 
$maxFileUpload = "30"; 



$target_path = "./upload/"; 
$target_path = $target_path . basename($fileupload_name); 

///////////////////////////////////////////////////////////////////////// 

$fileupload_temp  = $_FILES['fileupload']['tmp_name']; 
$fileupload_name  = $_FILES['fileupload']['name']; 
$fileupload_size  = $_FILES['fileupload']['size']; 
$fileupload_type  = $_FILES['fileupload']['type']; 
$fileupload_error = $_FILES['fileupload']['error']; 

// Controllo se Submit é impostato 

if (isset($_POST['Submit'])) 
{ 


if (isset($numberfile) && $numberfile == 1) 
{
move_uploaded_file($fileupload_temp, $target_path); 
$msg = "<span class=\"TestoLinks\">Il file $fileupload_name é stato caricato con successo.</span>"; 
$img = "<img src=\"./upload/$fileupload_name\" width=\"120\" height=\"80\">"; 
} 
else 
{
$numberfile = $_POST['uploadfile'];
for($i=1;$i<=$numberfile;$i++) 
{
move_uploaded_file($fileupload_temp['$i'], $target_path); 
$msg = "<span class=\"TestoLinks\">Il file $fileupload_name é stato caricato con successo.</span>"; 
$img = "<img src=\"./upload/$fileupload_name\" width=\"120\" height=\"80\">"; 
} 
}
}
?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> 
<title>Untitled Document</title> 
</head> 

<body> 


Seleziona il numero di file che vuoi caricare </p> 
<form id="selectNumber" name="selectNumber" method="post" action="<?php echo $_SERVER['PHP_SELF'];?>"> 
  <select name="uploadfile" id="uploadfile"> 
    <?php 
    for($i=1;$i<=$maxFileUpload;$i++) { 
    echo "<option value=\"$i\">$i</option>"; 
    } 
    ?> 
  </select> 
  <input name="go" type="submit" id="go" value="Go" /> 
</form> 
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post" enctype="multipart/form-data" name="fileupload" id="fileupload"> 
  <?php 
    for($i=1;$i<=$numberfile;$i++) { 
    echo "$i<input type=\"file\" name=\"fileupload".$i."\" id=\"fileupload".$i."\" />
"; 
    } 
    ?> 
  <input name="Submit" type="submit" id="Submit" value="Submit" /> 
</form> 


<?php echo $msg."
".$img;?></p> 
</body> 
</html>
non capisco come farli copiare nella cartella upload!!

Se sapete darmi altre dritte, ve ne sarei grato!

Grazie Michel