//メニューの数
var preimg1 = new Array(3);
for (i=1;i<3;i++){
    preimg1[i] = new Image;
    preimg1[i].src = "img/ext_menu_00"+(i)+"o.jpg";
}
//サブメニューの数
var preimg3 = new Array(2);
for (i=1;i<2;i++){
    preimg3[i] = new Image;
    preimg3[i].src = "img/ext_smenu_00"+(i)+"o.gif";
}
//カラーメニューの数
var preimg4 = new Array(8);
for (i=1;i<8;i++){
    preimg4[i] = new Image;
    preimg4[i].src = "img/ext_col_00"+(i)+"o.jpg";
}
//アクティブメニューの数
var preimg5 = new Array(3);
for (i=1;i<3;i++){
    preimg5[i] = new Image;
    preimg5[i].src = "img/ext_thum_00"+(i)+"o.jpg";
}
//アクティブメニューの数
var preimg6 = new Array(1);
for (i=1;i<1;i++){
    preimg5[i] = new Image;
    preimg5[i].src = "ext_replay_00"+(i)+"o.jpg";
}


function chimg1(over){
img1 = new Image;
img1.src = "img/ext_"+over+"o.jpg";
document.images[over].src = img1.src;
return true;
}

function bkimg1(out){
img2 = new Image;
img2.src = "img/ext_"+out+".jpg";
document.images[out].src = img2.src;
return true;
}

function chimg3(over){
img1 = new Image;
img1.src = "img/ext_"+over+"o.gif";
document.images[over].src = img1.src;
return true;
}

function bkimg3(out){
img2 = new Image;
img2.src = "img/ext_"+out+".gif";
document.images[out].src = img2.src;
return true;
}

function chimg4(over){
img1 = new Image;
img1.src = "img/ext_"+over+"o.jpg";
document.images[over].src = img1.src;
return true;
}

function bkimg4(out){
img2 = new Image;
img2.src = "img/ext_"+out+".jpg";
document.images[out].src = img2.src;
return true;
}

function chimg5(over){
img1 = new Image;
img1.src = "img/ext_"+over+"o.jpg";
document.images[over].src = img1.src;
return true;
}

function bkimg5(out){
img2 = new Image;
img2.src = "img/ext_"+out+".jpg";
document.images[out].src = img2.src;
return true;
}

function chimg6(over){
img1 = new Image;
img1.src = "img/ext_"+over+"o.jpg";
document.images[over].src = img1.src;
return true;
}

function bkimg6(out){
img2 = new Image;
img2.src = "img/ext_"+out+".jpg";
document.images[out].src = img2.src;
return true;
}