//for index bukken bn
function bkkayaon(){
    document.bkkaya.src="images/bk_kayaba2.jpg";
}
function bkkayaout(){
    document.bkkaya.src="images/bk_kayaba.jpg";
}
function bkfunaon(){
    document.bkfuna.src="images/bk_funa2.jpg";
}
function bkfunaout(){
    document.bkfuna.src="images/bk_funa.jpg";
}
function bkgnihonon(){
    document.bkgnihon.src="images/bk_nihon2.jpg";
}
function bkgnihonout(){
    document.bkgnihon.src="images/bk_nihon.jpg";
}
function bkmizuon(){
    document.bkmizu.src="images/bk_mizue2.jpg";
}
function bkmizuout(){
    document.bkmizu.src="images/bk_mizue.jpg";
}
function bknishion(){
    document.bknishi.src="images/bk_nishi2.jpg";
}
function bknishiout(){
    document.bknishi.src="images/bk_nishi.jpg";
}
function bkhigashion(){
    document.bkhiga10.src="images/bk_higashi2.jpg";
}
function bkhigashiout(){
    document.bkhiga10.src="images/bk_higashi.jpg";
}
function bkiriyaon(){
    document.bkiri.src="images/bk_iriya2.jpg";
}
function bkiriyaout(){
    document.bkiri.src="images/bk_iriya.jpg";
}
function bkshikion(){
    document.bkshiki.src="images/bk_shiki2.jpg";
}
function bkshikiout(){
    document.bkshiki.src="images/bk_shiki.jpg";
}
function bkumeon(){
    document.bkume.src="images/bk_ume2.jpg";
}
function bkumeout(){
    document.bkume.src="images/bk_ume.jpg";
}