uploading files

[Reham G]

hi alllll,
i've made a form which attach files but it works incorrectly....i want it to attach file after file like that of hotmail 'ok and attach another'.........plz help f1 f1!!!!!!!

here it is

<?

$ImgStr=$_REQUEST["ImgStr"];

if ($_FILES['Img']['tmp_name'])
{
$uploaddir = 'userimage/';
$uploadfile =$_FILES['Img']['name'];
if (move_uploaded_file($_FILES['Img']['tmp_name'],$uploaddir.$uploadfile))
{

if($ImgStr=="")
$ImgStr=$uploadfile;
else
$ImgStr.=";".$uploadfile;
}

}
?>




<form enctype="multipart/form-data" action="<?echo $_SERVER['PHP_SELF'];?>" method="post">

<input type="hidden" name="ImgStr" value="<?echo $ImgStr;?>" >
<input type="hidden" name="MAX_FILE_SIZE" value="30000" />
<input name="Img" type="file" />
<input type="submit" value="Ok & Attach another" />
</form>




<?
if($ImgStr!="")
{

$att=split(";",$ImgStr);

for($i=0;$i<sizeof($att);$i++)
{

echo $att[$i]."<br>";
}//next

}//end if
?>