public static function getMimeType($ext) {
		$ext = strtolower($ext);
		$mimes = array('hqx' => 'application/mac-binhex40', 'cpt' => 'application/mac-compactpro', 'doc' => 'application/msword', 
			'bin' => 'application/macbinary', 'dms' => 'application/octet-stream', 'lha' => 'application/octet-stream', 
			'lzh' => 'application/octet-stream', 'exe' => 'application/octet-stream', 'class' => 'application/octet-stream', 
			'psd' => 'application/octet-stream', 'so' => 'application/octet-stream', 'sea' => 'application/octet-stream', 
			'dll' => 'application/octet-stream', 'oda' => 'application/oda', 'pdf' => 'application/pdf', 
			'ai' => 'application/postscript', 'eps' => 'application/postscript', 'ps' => 'application/postscript', 
			'smi' => 'application/smil', 'smil' => 'application/smil', 'mif' => 'application/vnd.mif', 
			'xls' => 'application/vnd.ms-excel', 'ppt' => 'application/vnd.ms-powerpoint', 'wbxml' => 'application/vnd.wap.wbxml', 
			'wmlc' => 'application/vnd.wap.wmlc', 'dcr' => 'application/x-director', 'dir' => 'application/x-director', 
			'dxr' => 'application/x-director', 'dvi' => 'application/x-dvi', 'gtar' => 'application/x-gtar', 
			'php' => 'application/x-httpd-php', 'php4' => 'application/x-httpd-php', 'php3' => 'application/x-httpd-php', 
			'phtml' => 'application/x-httpd-php', 'phps'  => 'application/x-httpd-php-source', 'js' => 'application/x-javascript', 
			'swf' => 'application/x-shockwave-flash', 'sit' => 'application/x-stuffit', 'tar' => 'application/x-tar', 
			'tgz' => 'application/x-tar', 'xhtml' => 'application/xhtml+xml', 'xht' => 'application/xhtml+xml', 'zip' => 'application/zip', 
			'mid' => 'audio/midi', 'midi' => 'audio/midi', 'mpga' => 'audio/mpeg', 'mp2' => 'audio/mpeg', 'mp3' => 'audio/mpeg', 
			'aif' => 'audio/x-aiff', 'aiff' => 'audio/x-aiff', 'aifc' => 'audio/x-aiff', 'ram' => 'audio/x-pn-realaudio', 
			'rm' => 'audio/x-pn-realaudio', 'rpm' => 'audio/x-pn-realaudio-plugin', 'ra' => 'audio/x-realaudio', 
			'rv' => 'video/vnd.rn-realvideo', 'wav' => 'audio/x-wav', 'bmp' => 'image/bmp', 'gif' => 'image/gif', 'jpeg' => 'image/jpeg', 
			'jpg' => 'image/jpeg', 'jpe' => 'image/jpeg', 'png' => 'image/png', 'tiff' => 'image/tiff', 'tif' => 'image/tiff', 
			'css' => 'text/css', 'html' => 'text/html', 'htm' => 'text/html', 'shtml' => 'text/html', 'txt' => 'text/plain', 
			'text' => 'text/plain', 'log' => 'text/plain', 'rtx' => 'text/richtext', 'rtf' => 'text/rtf', 'xml' => 'text/xml', 
			'xsl' => 'text/xml', 'mpeg' => 'video/mpeg', 'mpg' => 'video/mpeg', 'mpe' => 'video/mpeg', 'qt' => 'video/quicktime', 
			'mov' => 'video/quicktime', 'avi' => 'video/x-msvideo', 'movie' => 'video/x-sgi-movie', 'doc' => 'application/msword', 
			'word' => 'application/msword', 'xl' => 'application/excel', 'eml' => 'message/rfc822');
		return (!isset($mimes[$ext])) ? 'application/octet-stream' : $mimes[strtolower($ext)];
	}