function cmnPreLoad(imgs){
  for(var i = 0; i < imgs.length; i++){
    var imgObj = new Image();
    imgObj.src = imgs[i];
  }

}

cmnPreLoad([
"/common/images/n8_pg_layout.jpg",
"/common/images/n8_hd_bg.jpg",
"/common/images/n8_lm_bnr_hd.gif",
"/common/images/n8_lm_bnr_ft.gif",
"/common/images/n8_lm_bg.gif"
]);



function iniRO(){
    if(!document.getElementById){
        return;
    }
    var preLoads=new Array();
    var allImages=document.getElementsByTagName('img');
 
    for (var i=0; i<allImages.length; i++){
		if(allImages[i].getAttribute("src").match("_off.")){
			var src = allImages[i].getAttribute('src');
            var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var tmp =src.substring(0,src.lastIndexOf('_off'));
            var on_src=tmp.concat('_on'+ftype);
			//alert(on_src);
 
            // on・offの画像の登録
            allImages[i].setAttribute('pSrc', src);
            allImages[i].setAttribute('oSrc', on_src);
 
            // on・offに使用する画像プリロード
            preLoads[i] = new Image();
            preLoads[i].src = on_src;
 
            // on・offイベント設定
            allImages[i].onmouseover=function(){
                this.setAttribute('src', this.getAttribute('oSrc'));
            }
            allImages[i].onmouseout=function(){
                this.setAttribute('src', this.getAttribute('pSrc'));
            }
        }
    }
}

window.onload=iniRO;