var menuImg;
menuImg = new Array;
for(i=0;i<9;i++){
	ImgPreload('menu_'+i, 'http://www.sorayume.mobi/appli/003hg/img/menu'+i+'.gif', 'http://www.sorayume.mobi/appli/003hg/img/menu'+i+'over.gif');
}
function ImgPreload() {
	var N = ImgPreload.arguments[0];
	menuImg[N] = new Image();
	menuImg[N][0] = new Image();
	menuImg[N][0].src = ImgPreload.arguments[1];
	menuImg[N][1] = new Image();
	menuImg[N][1].src = ImgPreload.arguments[2];
}
function ImgChange() {
	var imgID = ImgChange.arguments[0];
	var N  = ImgChange.arguments[1];
	document.getElementById(imgID).src = menuImg[imgID][N].src;
}