Inverse conditional comment: [if !IE]

<style type="text/css">
   p { color: red; font-weight: bold; }
</style>

<!--[if !IE]>-->
   <style type="text/css">
      p { color: green; font-weight: normal; }
   </style>
<!--<![endif]-->

<!--[if !IE]>-->
   <p>You can be happy: you don't use Internet Explorer! 
     <img src="images/smiley.gif"
     width="15" height="15" alt="">
   </p>
<!--<![endif]-->

In Internet Explorer this text is RED and BOLD,
in all other browsers it is GREEN and NORMAL