Upload an Image?

[reteep]

Hi,

I'm using this code to upload an image to a specified path:

if (isset($_REQUEST['btn_upload'])) {
		if (isset($_REQUEST['rb_format'])) {
			$subfolder = $_POST['rb_format'];
	}
	else {
		$err_msg = '<font color="#c00000"><b>Bitte Format des Banners angeben!</b></font><br />'; 
	}

	if ($err_msg != ''){
		echo $err_msg;
	}
	else {
		$vbulletin->input->clean_gpc("f","upload",TYPE_FILE); 
		require_once('./includes/class_upload.php'); 
		require_once('./includes/class_image.php'); 
		$upload = new vB_Upload_Image($vbulletin); 
		$upload->image =& vB_Image::fetch_library($vbulletin); 
		$upload->path = "./images/ads/".$subfolder.""; 
		echo $upload->path;
		if (!($upload->process_upload($vbulletin->GPC['upload']))){ 
	        eval(standard_error(fetch_error('there_were_errors_encountered_with_your_upload_x', $upload->fetch_error()))); 
	    } 
    }
}

However, it's always telling me the path would be incorrect. I tried different paths, even the root directory. Nothing helped. Also chmoded the "ads" path to 777, didn't help.

Any idea what could be wrong here?

Thanks a lot!