/**
 * 繧ｯ繝ｭ繧ｹ繝輔ぉ繝ｼ繝峨☆繧九Ο繝ｼ繝ｫ繧ｪ繝ｼ繝舌�蜃ｦ逅
 * rollover2.js
 * Copyright (c) 2007 KAZUMiX
 * http://d.hatena.ne.jp/KAZUMiX/20071017/rollover2
 * 
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 * 
 * 譖ｴ譁ｰ螻･豁ｴ
 * 2009/06/02 繝悶Λ繧ｦ繧ｶ縺ｮ縲梧綾繧九阪〒繝輔ぉ繝ｼ繝臥憾諷九′谿九▲縺ｦ縺�ｋ蝣ｴ蜷医↓蟇ｾ蜃ｦ
 * 2007/10/17 蜈ｬ髢
 */

(function(){
   // 繝壹�繧ｸ驕ｷ遘ｻ譎ゅ↓騾乗�縺ｫ縺吶ｋ逕ｨ
   var rolloverImages = [];
   
   function setRollOver2(){
     if(!document.images){return;}
     var imgs = document.images;
     var insert = [];
     for(var i=0,len=imgs.length; i<len; i++){
       var splitname = imgs[i].src.split('_out.');
       if(splitname[1]){
         var rolloverImg = document.createElement('img');
         rolloverImages.push(rolloverImg);
         rolloverImg.src = splitname[0]+'_in.'+splitname[1];
         var alpha = 0;
         rolloverImg.currentAlpha = alpha;
         rolloverImg.style.opacity = alpha/100;
         rolloverImg.style.filter = 'alpha(opacity='+alpha+')';
         rolloverImg.style.position = 'absolute';

         //繝ｭ繝ｼ繝ｫ繧ｪ繝ｼ繝舌�繝ｻ繧｢繧ｦ繝亥�逅�◎繧後◇繧後ｒ險ｭ螳
         addEvent(rolloverImg,'mouseover',function(){setFader(this,100);});
         addEvent(rolloverImg,'mouseout',function(){setFader(this,0);});

         // 蠕後〒霑ｽ蜉縺吶ｋ縺溘ａ縺ｫ霑ｽ蜉蝣ｴ謇縺ｨ蜈ｱ縺ｫ菫晏ｭ倥＠縺ｦ縺翫￥
         // 縺薙�譎らせ縺ｧ霑ｽ蜉縺吶ｋ縺ｨdocument.images縺梧嶌縺肴鋤繧上▲縺ｦ荳埼�蜷
         insert[insert.length] = {position:imgs[i],element:rolloverImg};
       }
     }
     // 竊代〒菴懊▲縺溘Ο繝ｼ繝ｫ繧ｪ繝ｼ繝舌�逕ｻ蜒上ｒ霑ｽ蜉
     for(i=0,len=insert.length; i<len ;i++){
       var parent = insert[i].position.parentNode;
       parent.insertBefore(insert[i].element,insert[i].position);
     }

     // 繝壹�繧ｸ驕ｷ遘ｻ譎ゅ↓縺ｯ繝輔ぉ繝ｼ繝臥憾諷九ｒ繧ｯ繝ｪ繧｢縺吶ｋ
     addEvent(window,'beforeunload', clearRollover);
   }

   // 謖�ｮ夊ｦ∫ｴ繧呈欠螳夐乗�蠎ｦ縺ｫ縺吶ｋ縺溘ａ縺ｮ繝輔ぉ繝ｼ繝峨い繝九Γ繧定ｨｭ螳壹☆繧矩未謨ｰ

   function setFader(targetObj,targetAlpha){
     targetObj.targetAlpha = targetAlpha;
     if(targetObj.currentAlpha==undefined){
       targetObj.currentAlpha = 100;
     }
     if(targetObj.currentAlpha==targetObj.targetAlpha){
       return;
     }
     if(!targetObj.fading){
       if(!targetObj.fader){
         targetObj.fader = fader;
       }
       targetObj.fading = true;
       targetObj.fader();
     }
   }

   // 繧｢繝ｫ繝輔ぃ蛟､繧偵ち繝ｼ繧ｲ繝�ヨ蛟､縺ｫ霑代▼縺代ｋ髢｢謨ｰ
   // 繧ｿ繝ｼ繧ｲ繝�ヨ蛟､縺ｫ縺ｪ縺｣縺溘ｉ邨ゆｺ

   function fader(){
     this.currentAlpha += (this.targetAlpha - this.currentAlpha)*0.3;
     if(Math.abs(this.currentAlpha-this.targetAlpha)<1){
       this.currentAlpha = this.targetAlpha;
       this.fading = false;
     }
     var alpha = parseInt(this.currentAlpha);
     this.style.opacity = alpha/100;
     this.style.filter = 'alpha(opacity='+alpha+')';
     if(this.fading){
       var scope = this;
       setTimeout(function(){fader.apply(scope)},50);
     }
   }
   
   // 縺吶∋縺ｦ縺ｮ繝ｭ繝ｼ繝ｫ繧ｪ繝ｼ繝舌�逕ｻ蜒上ｒ繧帝乗�縺ｫ縺吶ｋ髢｢謨ｰ�磯�遘ｻ譎ら畑�

   function clearRollover(){
     for(var i=0,len=rolloverImages.length; i<len; i++){
       var image = rolloverImages[i];
       image.style.opacity = 0;
       image.style.filter = 'alpha(opacity=0)';
     }
   }

   // 繧､繝吶Φ繝医ｒ霑ｽ蜉縺吶ｋ髢｢謨ｰ

   function addEvent(eventTarget, eventName, func){
     if(eventTarget.addEventListener){
       // 繝｢繝繝ｳ繝悶Λ繧ｦ繧ｶ
       eventTarget.addEventListener(eventName, func, false);
     }else if(window.attachEvent){
       // IE
       eventTarget.attachEvent('on'+eventName, function(){func.apply(eventTarget);});
     }
   }

   addEvent(window,'load',setRollOver2);

 })();