Conditional comments for IE

HTML
Show content if in IE

<!--[if IE]>
Show in IE
<![endif]-->

Show content if NOT in IE

<!--[if !IE]>-->
NOT show in IE
<!--<![endif]-->

PHP
code to detect IE

     function not_use_ie() {
	$user_agent = $_SERVER['HTTP_USER_AGENT'];
	$ub = True;
	if (preg_match('/MSIE/i', $user_agent)) {
	$ub = False;
	}
      return $ub;
     }