preroad() 
function preroad(){ 
f_name = new Array 
file = new Array 

//先行読みこみしたい画像分だけ要素数を追加する 
f_name[1] = "img/icon/system2.gif" 
f_name[2] = "img/icon/promise2.gif" 
f_name[3] = "img/icon/qa2.gif" 
f_name[4] = "img/icon/voice2.gif" 
f_name[5] = "img/icon/info2.gif" 
f_name[6] = "img/icon/soudan2.gif" 
f_name[7] = "img/menu/ele2.gif" 
f_name[8] = "img/menu/etc2.gif" 
f_name[9] = "img/menu/inter2.gif" 
f_name[10] = "img/menu/iya2.gif" 
f_name[11] = "img/menu/kigyo2.gif" 
f_name[12] = "img/menu/koudou2.gif" 
f_name[13] = "img/menu/sinzyo2.gif" 
f_name[14] = "img/menu/stalk2.gif" 
f_name[15] = "img/menu/syozai2.gif" 
f_name[16] = "img/menu/toutyou2.gif" 
f_name[17] = "img/menu/uwaki2.gif" 

var i 
for(i = 1;f_name.length > i;i++) 
{file[i] = new Image();file[i].src = f_name[i]} 
}