if(navigator.appName=="Microsoft Internet Explorer"){
if(navigator.userAgent.indexOf("Mac")==-1){
document.write('<link rel="stylesheet" type="text/css" href="win_IE.css">');
}
else
document.write('<link rel="stylesheet" type="text/css" href="mac_IE.css">');
}
else if(navigator.userAgent.indexOf('Safari') != -1){
document.write('<link rel="stylesheet" type="text/css" href="safari.css">');
}
else if (navigator.userAgent.match(/Opera[\/\s](\d\.\d+)/)) {
document.write('<link rel="stylesheet" type="text/css" href="nc_5.css">');
}
else if(navigator.userAgent.indexOf("Firefox")!=-1){
document.write('<link rel="stylesheet" type="text/css" href="win_IE.css">');
}
else if(navigator.appName=="Netscape" && navigator.appVersion.substring(0,1)==5){
document.write('<link rel="stylesheet" type="text/css" href="nc_5.css">');
}
else
document.write('<link rel="stylesheet" type="text/css" href="nc_4.css">');