function parseURLs($str, $length = 15){
		preg_match_all('@(https?://([-\w\.]+)+(:\d+)?(/([-\w/_\.]*(\?\S+)?)?)?)@',$str,$matches);
		if($matches){
			foreach($matches[0] as $url){
				$text = $length ? shortText($url,$length) : $url;
				$replace = '<a href="'.$url.'">'.$text.'</a>';
				$str = str_replace($url,$replace,$str);
			}
		}		
		return $str;			
	}
 
	function shortText($text, $chars){
		$str = $text;
		if(strlen($str) > $chars){ 
			$str = substr($str, 0, $chars); 
			$str .= "..."; 
			return $str;
		}else { 
			return $str; 
		} 
	}