var a = navigator.userAgent
var b = navigator.appName

if(a.indexOf("Mac") != -1)
{	document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="style/style_mac.css">');
}
else
{	if (b=="Netscape") document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="style/style_nn.css">');
	else if (b=="Microsoft Internet Explorer") document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="style/style_ie.css">');
}