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

var fontSizeUnit = "%";
var perOrder = 20;
var defaultSize = 80;
var ckName1 = "fSize";
var ckName2 = "fColor";
var ckDays = 7;
var ckPath = "/"
var fmax=130;
var fmin=60;
var css1= "/css/color1.css";
var css2= "/css/color2.css";
var colorflag;
var fsCK = GetCookie(ckName1);
var clCK = GetCookie(ckName2);

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

////////////////////////////////////////////// 
// font change load
//////////////////////////////////////////////
function fsizeChg(){

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

  else if( document.body ){
  if(currentSize >= fmin && currentSize <= fmax){
    document.body.style.fontSize = currentSize + fontSizeUnit;
	}
  }
  
}

////////////////////////////////////////////// 
// font change
//////////////////////////////////////////////
function fsize( CMD ){

  if( CMD == "larger" ){
    var newSize = Number( currentSize + perOrder );
    SetCookie( ckName1 , newSize );
  }

  if( CMD == "smaller" ){
    if ( currentSize != perOrder ){
      var newSize = Number( currentSize - perOrder );
      SetCookie( ckName1 , newSize );
    }
    else{
      var newSize=Number(currentSize);
    }
  }

  if( CMD == "default" ){
    var newSize = defaultSize;
    DeleteCookie( ckName1 ); 
  }


  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;
  fsizeChg();
  }
}


////////////////////////////////////////////// 
// set cookie
//////////////////////////////////////////////

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;
}


////////////////////////////////////////////// 
// get cookie
//////////////////////////////////////////////

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;
  }
}
////////////////////////////////////////////// 
// color
//////////////////////////////////////////////
function colorChg(){
if(colorflag){
	colorSet(css1);
	SetCookie( ckName2 , "white" );
	colorflag="";
	}else{
	colorSet(css2);
	SetCookie( ckName2 , "black" );
	colorflag=1;
	}
}

function colorSet(css){
	if(!document.getElementById) return false;
	var element = document.getElementById("fontstyle");
	if(!element || !element.cloneNode) return false;
	var new_node = element.cloneNode(true);
	new_node.href = css;
	element.parentNode.replaceChild(new_node,element);
	return true;
}

function colorLoad(){
if(clCK){
	if(clCK =="white"){colorSet(css1);colorflag="";}
	if(clCK =="black"){colorSet(css2);colorflag="1";}
}else{
	colorflag="";
	colorSet(css1);
}
}