highlight keywords issue

Heya all, I'm trying to highlight search keywords in a string, everything work expect when this keyword is inside a tag like this : keyword (php) : <a href="?go=php">php</a> <img src="php.gif" border=0 alt="php.net"> will be highlighted to : <a href="?go=<b style="color: black; background-color: #ffff66">php</b>"><b style="color: black; background-color: #ffff66">php</b></a> <img src="<b style="color: black; background-color: #ffff66">php</b>.gif" border=0 alt="<b style="color: black; background-color: #ffff66">php</b>.net"> I have tryed to separate text from html, then highlight it then join html/text again, but this will be very long and not really usefull ! I'm using preg_replace : preg_replace('|\b('.quotemeta($keyword).')\b|iU', '<b style="color: black; background-color: #ffff66">\\1</b>', $content); Any help to fix that ? Thanks; Hatem