<script>        
     var usersonline = document.all['uonline'].innerHTML;        
     if(usersonline.indexOf("vip") > -1)        
       usersonline = usersonline.replace('vip','<font color="red">vip</font> <img src="http://www.coolz.ucoz.ru/sml/369.gif">');        
     document.all['uonline'].innerHTML = usersonline;        
     </script>