function parseYoutubeUrls($text, $width = -1, $height = -1)
	{
		// defaults
		if($width == -1) { $width = 425; }
		if($height == -1) {	$height = round((344/425) * $width); }

		// get all urls in text
		$regexp = "/<a\s+.*?href=[\"\']?([^\"\' >]*)[\"\']?[^>]*>(.*)<\/a>/i";
		if(preg_match_all($regexp, $text, $matches, PREG_SET_ORDER))
		{
			// check each url
			foreach($matches as $match)
			{
				// replace all youtube urls with embedded flash player
				if(preg_match_all("/www.youtube.com/",$match[1],$hit))
				{
					$parsedUrl = parse_url($match[1]);
					parse_str($parsedUrl["query"], $query);
					$videoId = ($query['v']);
					$replace = '<p><object width="'.$width.'" height="'.$height.'"><param name="movie" value="http://www.youtube.com/v/'.$videoId.'&hl=sv&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/'.$videoId.'&hl=sv&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="'.$width.'" height="'.$height.'"></embed></object></p>';
					$text = str_replace($match[0],$replace, $text);
				}
			}
		}
		return $text;
	}