uaName = navigator.userAgent;
appName = navigator.appVersion;



var fontSizeUnit = "%";
var perOrder = 20;
var defaultSize = 76;
var ckName = "FSCb";
var ckDays = 2;
var ckPath = "/"

var fsCK = GetCookie(ckName);

if ( fsCK == null ) {
  currentSize = defaultSize;
}
else{
  currentSize = Number(fsCK);
}


function fscRef(){

  if (( document.layers )||(( appName.indexOf("Mac",0) != -1 ) && ( uaName.indexOf("MSIE 4.0",0) != -1 ))){
    return false;
  }

  else if( document.body ){
  
    document.body.style.fontSize = currentSize + fontSizeUnit;
  }
  
}


function fsc( CMD ){

  if( CMD == "larger" ){
    var newSize = Number( currentSize + perOrder );
    SetCookie( ckName , newSize );      //???????????????
  }

  if( CMD == "smaller" ){
    if ( currentSize != perOrder ){
      var newSize = Number( currentSize - perOrder );
      SetCookie( ckName , newSize );      //???????????????
    }
    else{
      var newSize=Number(currentSize);
    }
  }

  if( CMD == "default" ){
    var newSize = defaultSize;
    DeleteCookie( ckName );
  }

  if( document.layers ){
    window.alert( "Netscape Communicator4.x");
    return false;
  }

  else if(( appName.indexOf("Mac",0) != -1 ) && ( uaName.indexOf("MSIE 4.0",0) != -1)){
    window.alert( "Sorry! MacIE4.0 is not supported." );
    return false;
  }

  else{
  currentSize = newSize;

  fscRef();
  }
}




function SetCookie(name,value){
  var dobj = new Date();
  dobj.setTime( dobj.getTime() + 24 * 60 * 60 * ckDays * 1000);
  var expiryDate = dobj.toGMTString();
  document.cookie = name + '=' + escape(value)+ ';expires=' + expiryDate + ';path=' + ckPath;
}

function GetCookie (name){
  var arg  = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen){
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
    return getCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
  }
   return null;
}

function getCookieVal (offset){
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
  endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset,endstr));
}

function DeleteCookie(name){
  if (GetCookie(name)) {
    document.cookie = name + '=' +
    '; expires=Thu, 01-Jan-70 00:00:01 GMT;path='+ckPath;
  }
}