function msieversion()
{
	var ua = window.navigator.userAgent
	var msie = ua.indexOf ( "MSIE " )
	if ( msie > 0 )
		return parseInt (ua.substring (msie+5, ua.indexOf (".", msie )))
		else
	return 0
}

if ( msieversion() >= 7 )
	document.write ('<link href="css/screen.css" rel="stylesheet" type="text/css" media="screen" />');
else if ( msieversion() >= 5 )
	document.write ( '<link href="css/ie.css" rel="stylesheet" type="text/css" media="screen" /><script type="text/javascript" src="scripts/dropdown.js"></script>' );
else
	document.write ( '<link href="css/screen.css" rel="stylesheet" type="text/css" media="screen" />' );