if((navigator.appName=="Netscape")&&(parseInt(navigator.appVersion)<=4)){
	document.write('<link rel="stylesheet" type="text/css" href="css/nc.css">');

}else if((navigator.userAgent.indexOf("Mac",0)!=-1)&&(navigator.userAgent.indexOf("Gecko") != -1)){
	document.write('<link rel="stylesheet" type="text/css" href="css/mac_gecko.css">');

}else if((navigator.userAgent.indexOf("MSIE",0)!=-1)&&(navigator.userAgent.indexOf("Mac",0)!=-1)){
	document.write('<link rel="stylesheet" type="text/css" href="css/mac_ie.css">');

}else{
	document.write('<link rel="stylesheet" type="text/css" href="css/ie.css">');
}