/*ロールオーバー*/
function swapimg(ImgName, ImgSrc) {
document.images[ImgName].src=ImgSrc;
}

/*プレロード*/
BtnImg = new Array();
for(i=0; i<=7; i++) {
BtnImg[i] = new Image();
}
BtnImg[0].src = "img/topbtn01_o.jpg";
BtnImg[1].src = "img/topbtn02_o.jpg";
BtnImg[2].src = "img/topbtn03_o.jpg";
BtnImg[3].src = "img/topbtn04_o.jpg";
BtnImg[4].src = "img/topbtn05_o.jpg";
BtnImg[5].src = "img/topbtn06_o.jpg";
BtnImg[6].src = "img/topbtn07_o.jpg";


<!--
function chkwinsize(arg)
	{
		if(arg)
			{
			if (document.all){
				wX = document.body.clientWidth;wY = document.body.clientHeight
			} 
			else{
				wX = window.innerWidth;wY= window.innerHeight
			}
		
			if(arg=="x") return wX;
			else if(arg=="y") return wY;
			}
	}
//-->