var browser_type=navigator.appName
var browser_version=parseInt(navigator.appVersion)

if (browser_type=="Netscape"&&browser_version>=5)
	//NS 6
	document.write('<link href="http://www.unav.es/enred/anai/catalogo/css/asignatura_ns6.css" rel="stylesheet" type="text/css" />')
else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=4)
	//IE 4+
	document.write('<link href="http://www.unav.es/enred/anai/catalogo/css/asignatura_ie4.css" rel="stylesheet" type="text/css" />')
else if (browser_type=="Netscape"&&browser_version>=4)
	//NS4+
	document.write('<link href="http://www.unav.es/enred/anai/catalogo/css/asignatura_ns4.css" rel="stylesheet" type="text/css" />')
else
	//Default goto page (NOT NS 4+ and NOT IE 4+)
	document.write('<link href="http://www.unav.es/enred/anai/catalogo/css/asignatura_otros.css" rel="stylesheet" type="text/css" />')