chk_browser();
 function chk_browser(browserName)
 {
	var ua = navigator.userAgent
	switch (browserName)
	{
		case 'konqueror' :
			return ua.indexOf("Konqueror") != -1 ; break ;
		case 'safari' :
			return ua.indexOf("Safari") != -1 ; break ;
		dafault :
			return null ; break ;
	}
}