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function ReplaceLinks($text)
{
  $urlsearch[] = "/([^]_a-z0-9-=\"'\/])((https?|ftp):\/\/|www\.)([^ \r\n\(\)\*\^\$!`\"'\|\[\]\{\};<>]*)/si";
  $urlsearch[] = "/^((https?|ftp):\/\/|www\.)([^ \r\n\(\)\*\^\$!`\"'\|\[\]\{\};<>]*)/si";
  $urlreplace[]= "\\1[URL]\\2\\4[/URL]";
  $urlreplace[]= "[URL]\\1\\3[/URL]";
  $text = preg_replace($urlsearch, $urlreplace, $text);
  $text = preg_replace("/\[URL\](.*?)\[\/URL\]/si"      , "<a href=\"\\1\" alt=\"\" target=\"blank\" style=\"text-decoration:none\">\\1</a>", $text);
  $text = preg_replace("/\[URL=(.*?)\](.*?)\[\/URL\]/si", "<a href=\"\\1\" alt=\"\" target=\"blank\" style=\"text-decoration:none\">\\2</a>", $text);
  
  $text=str_replace("href=\"www","href=\"http://www",$text);
  
  return($text);
}