image helper bug

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if (!file_exists(DIR_IMAGE . $filename)) {
	return;
}

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<b>Warning</b>:  getimagesize(D:\EasyWAMP\www\v132/image/) [<a href='function.getimagesize'>function.getimagesize</a>]: failed to open stream: Permission denied in <b>D:\EasyWAMP\www\v132\system\library\image.php</b> on line <b>11</b><br />

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if ($filename == "" || !file_exists(DIR_IMAGE . $filename)) {
	return;
}

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if (!is_file(DIR_IMAGE . $filename)) {
   return;
}

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$file = DIR_SYSTEM . 'library/' . $library . '.php';
		
if (file_exists($file)) {
    include_once($file);
} else {
    exit('Error: Could not load library ' . $library . '!');
}