помогите с загрузкой картинки imageshack

Вот такой код прекрасно работает на локальном сервере (правда под винду) и не работает ни на одном хостере.

<?php
        function uploadToImageshack($filename, $vars, $fi) {

//          print_r($fi['fileupload']['type']);
                $ch = curl_init("http://www.imageshack.us/index.php");

//		$post['cookie']='your cookie';
                $post['xml']='yes';
                $post['fileupload']='@'.$filename;
		            $post['rembar'] = intval($vars['rembar']) == 0 ? 1 : 0;
		            $post['optimage'] = $vars['optimage'];
		            $post['optsize'] = $vars['optsize'];

                curl_setopt($ch, CURLOPT_URL, "http://www.imageshack.us/index.php");
                curl_setopt($ch, CURLOPT_POST, true);
                curl_setopt($ch, CURLOPT_HEADER, false);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($ch, CURLOPT_TIMEOUT, 240);
                curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
                curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect: '));
//                curl_setopt ( $ch , CURL_HTTPHEADER , "Content-type: ".$fi['fileupload']['type'] );
//                curl_setopt ( $ch , CURLOPT_HTTPHEADER , "Content-type: multipart/form-data" );
                
          
                
                $result = curl_exec($ch);
                echo "<br>result:<pre style='color:blue'>";
                print_r(htmlentities($result));
                echo "</pre>";
//                exit;
                curl_close($ch);

                if (strpos($result, '<'.'?xml version="1.0" encoding="iso-8859-1"?>') === false) {
                        return null;
                } else {
                        return $result; // XML data
                }

        }




//if(!isset($HTTP_POST_FILES['fileupload'])) { 

//} else {

//	$source = $HTTP_POST_FILES['fileupload']['tmp_name'];
//  print_r($HTTP_POST_FILES);
//	$dest = '/tmp/'.$HTTP_POST_FILES['fileupload']['name'];
//  $dest = $_SERVER[DOCUMENT_ROOT].'forum/tmp/'.$HTTP_POST_FILES['fileupload']['name'];
//  echo $zz = "/Library/WebServer/ua.org.pregnancy/htdocs/forum/tmp/ff2.jpg";
  echo "<br>path:=".$zz = $_SERVER[DOCUMENT_ROOT]."/forum/tmp/ff1.jpg";
  echo "<br>mktime:=".mktime();
//	copy($source, $dest);
	$xmlString = uploadToImageshack($zz, $HTTP_POST_VARS, $HTTP_POST_FILES);
//	unlink($source); 
//	unlink($dest);

	if ($xmlString) { 

		$xmlData = explode("\n", $xmlString);
	
		foreach($xmlData as $xmlDatum){
			$xmlDatum = trim($xmlDatum);
			if($xmlDatum != "" && !eregi("links",$xmlDatum) && !eregi("xml",$xmlDatum)){
				$xmlDatum = str_replace(">","<",$xmlDatum);
				list($xmlNull,$xmlName,$xmlValue) = explode("<",$xmlDatum);
				$xmlr[$xmlName] = $xmlValue;

			}
		}

		if (empty($_POST['thumb']) || $xmlr['thumb_exists'] == 'no') {
			$text = '';
		} else {
			$text = ' . ']';
		}

echo "TRUE".$text;

	} else {

  echo "ERROR";
	}
//}

?>

Результат домашнего выполенния скрипта 

path:=D:/www/site.ua/forum/tmp/ff1.jpg
mktime:=1304919474
result:
<?xml version="1.0" encoding="iso-8859-1"?><links>
    <image_link>http://img641.imageshack.us/img641/2197/ff1d.jpg</image_link>
    <thumb_link>http://img641.imageshack.us/img641/2197/ff1d.th.jpg</thumb_link>
    <ad_link>http://img641.imageshack.us/my.php?image=ff1d.jpg</ad_link>
    <thumb_exists>yes</thumb_exists>
    <total_raters>0</total_raters>
    <ave_rating>0.0</ave_rating>
    <image_location>img641/2197/ff1d.jpg</image_location>
    <thumb_location>img641/2197/ff1d.th.jpg</thumb_location>
    <server>img641</server>
    <image_name>ff1d.jpg</image_name>
    <done_page>http://img641.imageshack.us/content.php?page=done&amp;l=img641/2197/ff1d.jpg</done_page>
    <resolution>240x350</resolution>
    <filesize>19762</filesize>
    <image_class>r</image_class>
</links>
TRUE

результат работы на сервере

path:=/usr/home/mylogin/domains/site.ua/public_html/forum/tmp/ff1.jpg
mktime:=1304919757
result:
<links>
<error id="wrong_file_type">Wrong file type detected for file ff1.jpg:application/octet-stream</error>
</links>
ERROR

ПОМОГИТЕ! Реально уже не знаю что и делать!

Спасибо.