You have left the braces from the md5 function. Remove them
<?phpif(isset($_POST[submit])){
$imgNumb=1; //This the "pointer" to images
$DestinationDir="images/"; //Place the destination dir here
$LargeDir="images/"; //Place the large image dir here
do{
$Unique=$_FILES['img$imgNumb']['name']; // We want unique names, right?
$destination=$DestinationDir.$Unique.".jpg";
$thumb=$ThumbDir.$Unique.".jpg";
$IMG=getimagesize($_FILES["img$imgNumb"][tmp_name]);
echo resize($_FILES["img$imgNumb"][tmp_name], $IMG[0], $destination);
echo resize($_FILES["img$imgNumb"][tmp_name], 120, $thumb); //That was what I forgot last time
$imgNumb++;
} while($_FILES["img$imgNumb"][name]);
}
?>