/*--------------------------------------------------------------------------*
 *  
 *  footerFixed.js
 *  
 *  MIT-style license. 
 *  
 *  2007 Kazuma Nishihata [to-R]
 *  http://blog.webcreativepark.net
 *  
 *--------------------------------------------------------------------------*/

new function(){
  
  var footerId = "footer";
  //メイン
  function footerFixed(){
    //ドキュメントの高さ
    var dh = document.getElementsByTagName("body")[0].clientHeight;
    //フッターのtopからの位置
    document.getElementById(footerId).style.top = "0px";
    var ft = document.getElementById(footerId).offsetTop;
    //フッターの高さ
    var fh = document.getElementById(footerId).offsetHeight;
    //ウィンドウの高さ
    if (window.innerHeight){
      var wh = window.innerHeight;
    }else if(document.documentElement && document.documentElement.clientHeight != 0){
      var wh = document.documentElement.clientHeight;
    }
    if(ft+fh<wh){
      document.getElementById(footerId).style.position = "relative";
      document.getElementById(footerId).style.top = (wh-fh-ft-1)+"px";
    }
  }
  
  //文字サイズ
  function checkFontSize(func){
  
    //判定要素の追加  
    var e = document.createElement("div");
    var s = document.createTextNode("S");
    e.appendChild(s);
    e.style.visibility="hidden"
    e.style.position="absolute"
    e.style.top="0"
    document.body.appendChild(e);
    var defHeight = e.offsetHeight;
    
    //判定関数
    function checkBoxSize(){
      if(defHeight != e.offsetHeight){
        func();
        defHeight= e.offsetHeight;
      }
    }
    setInterval(checkBoxSize,1000)
  }
  
  //イベントリスナー
  function addEvent(elm,listener,fn){
    try{
      elm.addEventListener(listener,fn,false);
    }catch(e){
      elm.attachEvent("on"+listener,fn);
    }
  }

  addEvent(window,"load",footerFixed);
  addEvent(window,"load",function(){
    checkFontSize(footerFixed);
  });
  addEvent(window,"resize",footerFixed);
  
}