if(navigator.userAgent.indexOf("Mac")!=-1){
	document.write('<link rel="stylesheet" type="text/css" href="mac.css">');
}else if((navigator.appName=="Netscape")&&(parseInt(navigator.appVersion)<=4)){
	document.write('<link rel="stylesheet" type="text/css" href="nn4.css">');
}else if(navigator.userAgent.indexOf("Gecko")!=-1){
	document.write('<link rel="stylesheet" type="text/css" href="nn.css">');
}else{
	document.write('<link rel="stylesheet" type="text/css" href="win.css">');
}