Here is a code to detect weather the visitor if your webpage is using ie or not:

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if (isset($_SERVER['HTTP_USER_AGENT']) && 
    (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false)) 
	{
	echo "You are using ie";
	}  
	else { 
	echo "You are not using ie"; 
	}

I am using this simple PHP code while developing HybridPass, a new authentication tool for web applications. My Javascript is only compatible with ie at the moment, so until I develop it more to support other browsers it is important to give my visitors the right feedback.