var subNaviImg; subNaviImg = new Array;

subNavi('over01', 'indexImage/home05.gif', 'indexImage/home05_f2.gif');
subNavi('over02', 'indexImage/home10.gif', 'indexImage/home10_f2.gif');
subNavi('over03', 'indexImage/home11.gif', 'indexImage/home11_f2.gif');

function subNavi() {
	var N = subNavi.arguments[0];
	subNaviImg[N] = new Image();
	subNaviImg[N][0] = new Image();
	subNaviImg[N][0].src = subNavi.arguments[1];
	subNaviImg[N][1] = new Image();
	subNaviImg[N][1].src = subNavi.arguments[2];
}

function over() {
	var ID = over.arguments[0];
	var N  = over.arguments[1];
	document.images[ID].src = subNaviImg[ID][N].src;
}