//グローバルメニューの数
var preimg = new Array(4);
for (i=1;i<5;i++){
    preimg[i] = new Image;
    preimg[i].src = pass+"img/mainmenu"+(i)+"_ro.gif";
}


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

function bkimg(out){
img2 = new Image;
img2.src = pass +"img/"+out+".gif";
if(out!=mymenu){
document.images[out].src = img2.src;
}
return true;
}

function mysetmenu(){
  if(mymenu){
    chimg(mymenu);
  }
}