function ChooseStyle(nLevel)
{
  switch(nLevel) 
  {
    case 0:
      if(navigator.appName=="Netscape")
        if(navigator.appVersion.charAt(0)=="4")
          document.write('<link rel="stylesheet" type="text/css" href="Script/styles_ns4.css">');
        else
          document.write('<link rel="stylesheet" type="text/css" href="Script/styles_ns.css">');
      else
        document.write('<link rel="stylesheet" type="text/css" href="Script/styles.css">');
    break;
    case 1:
      if(navigator.appName=="Netscape")
        if(navigator.appVersion.charAt(0)=="4")
          document.write('<link rel="stylesheet" type="text/css" href="../Script/styles_ns4.css">');
        else
          document.write('<link rel="stylesheet" type="text/css" href="../Script/styles_ns.css">');
      else
        document.write('<link rel="stylesheet" type="text/css" href="../Script/styles.css">');
    break;
    default:
    break;
  }
}