// 画像数を指定
var graphNum = 16;
var img = new Array();
for (i = 0; i < graphNum; i++){
  img[i] = new Image();};

// 画像の宣言
img[0].src = "img/loc1-1.gif";
img[1].src = "img/loc1-2.gif";
img[2].src = "img/loc2-1.gif";
img[3].src = "img/loc2-2.gif";
img[4].src = "img/loc3-1.gif";
img[5].src = "img/loc3-2.gif";
img[6].src = "img/loc4-1.gif";
img[7].src = "img/loc4-2.gif";
img[8].src = "img/loc5-1.gif";
img[9].src = "img/loc5-2.gif";
img[10].src = "img/loc6-1.gif";
img[11].src = "img/loc6-2.gif";
img[12].src = "img/loc7-1.gif";
img[13].src = "img/loc7-2.gif";
img[14].src = "img/loc8-1.gif";
img[15].src = "img/loc8-2.gif";



// ロールオーバー関数
function rollover(loc,imgname) {
document.images[loc].src = eval(imgname + ".src") };