Firefox aanraden bij gebruik IE (Opgelost)

$browser_user_agent = ( isset($_SERVER['HTTP_USER_AGENT']) ) ? strtolower($_SERVER['HTTP_USER_AGENT']) : '';
if(stristr($browser_user_agent, "msie")) 
{ 
	echo '<script type="text/javascript">
	alert("This page is not shown correctly by IE. Use an other browser to see this site in the correct way.");
	</script>';
} 

$browser_user_agent = ( isset($_SERVER['HTTP_USER_AGENT']) ) ? strtolower($_SERVER['HTTP_USER_AGENT']) : '';
if(stristr($browser_user_agent, "msie")) 
{ 
	echo '<script type="text/javascript">
	alert("This page is not shown correctly by IE. Use an other browser to see this site in the correct way.");
	</script>';
}