tipo = navigator.appName;
browserVer = navigator.userAgent

if (tipo == "Microsoft Internet Explorer") brw = "exp";

else brw = "net";

if ((navigator.userAgent.indexOf("Opera")!=-1) ||(navigator.userAgent.indexOf("Opera/6")!=-1))
{
	brw="opera"
}

if (brw=="exp")
   {
   	document.write ('<link href="css/default_ie.css" hreflang="en" charset="UTF-8" rel="stylesheet" type="text/css" />')
	
}

if (brw=="net")
{
	document.write ('<link href="css/default_ns.css" hreflang="en" charset="UTF-8" rel="stylesheet" type="text/css" />')
}

if (brw=="opera")
{
	document.write ('<link href="css/default_op.css" hreflang="en" charset="UTF-8" rel="stylesheet" type="text/css" />')
}