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

var fontSizeUnit = "em";
var defaultSize = "0.8725";
var ckName = "zaisyu";
var ckDays = 2;
var ckPath = "/"
var fsCK = GetCookie(ckName);

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

	switch (size) { 
	case "larger": 
    var newSize = "1.09";
		break;
	case "smaller":
    var newSize = "0.7125";
		break;
	case "default":
    var newSize = "0.8725";
		break;
	}

  SetCookie( ckName , newSize );

  if( document.layers ){
    window.alert( "このスクリプトはNetscape Communicator4.xでは動作しません" );
    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;
  }
}