problema al cargar imagenes

[joaquina5]

Eso no va, estas son las lineas que me dan problemas, lo que necesito es que si no insertas imagen no me oblige a cargar ninguna, simplmente me respete que no quiera dar imagen. Gracias

$userfile2=(isset($_FILES['userfile']['tmp_name']) ? $_FILES['userfile']['tmp_name'] : "");
$userfile_name = date("YmdGis").$_FILES['userfile']['name'];
$imagesize = $_FILES['userfile']['size'];

if (( $imageenabled == 2 ) || ( ($imageenabled == 1) && (!empty($userfile_name)) ) ) {

$base_Dir = ELPATH.'/../../images/eventlist/location/';
$sizelimit = $sizelimit*1024; //size limit in kb

if (empty($userfile_name)) {
mosRedirect("index.php?option=$option&Itemid=$Item id", _EVENTS_IMAGEEMPT." ");
}

if ($imagesize > $sizelimit) {
mosRedirect("index.php?option=$option&Itemid=$Item id", _EVENTS_IMAGESIZEBIG." ");
}

$filename = split("\.", $userfile_name);

if (eregi("[^0-9a-zA-Z_]", $filename[0])) {
mosRedirect("index.php?option=$option&Itemid=$Item id", _EVENTS_IMAGECHARACT." ");
}

if (file_exists($base_Dir.$userfile_name)) {
mosRedirect("index.php?option=$option&Itemid=$Item id", _EVENTS_IMAGEEXIST." ");
}

if ((strcasecmp(substr($userfile_name,-4),".gif")) && (strcasecmp(substr($userfile_name,-4),".jpg")) && (strcasecmp(substr($userfile_name,-4),".png")) && (strcasecmp(substr($userfile_name,-4),".bmp"))) {
mosRedirect("index.php?option=$option&Itemid=$Item id", _EVENTS_IMAGETYPE." ");
}

if (!move_uploaded_file ($_FILES['userfile']['tmp_name'],$base_Dir.date("YmdGis").$_FILES['userfile']['name']) || !mosChmod($base_Dir.date("YmdGis").$_FILES['userfile']['name'])) {
mosRedirect("index.php?option=$option&Itemid=$Item id", _EVENTS_IMAGEFAIL." ");
} else {
$file = $base_Dir.$userfile_name;

//chmod Bild
@chmod ($file, octdec($imagechmod));

//Vorbereiten auf Thumbnailerstellung
$thumbdir = $base_Dir.'small/';
$save = $thumbdir.$userfile_name;

if ($imageprob = 1) {
$imageprob = TRUE;
} else {
$imageprob = FALSE;
}

if ($gddisabled == 1) {
evlist_imgd::thumb($file, $save, $imagewidth, $imagehight, $imageprob);
}
}

$_POST['locimage'] = $userfile_name ;
}