function changeImage1(){
    document.c_pic.src="img/menu_home-b.jpg";
}
function changeImage2(){
    document.c_pic.src="img/menu_home.jpg";
}
function changeImage3(){
    document.c_pic2.src="img/menu_pro-b.jpg";
}
function changeImage4(){
    document.c_pic2.src="img/menu_pro.jpg";
}
function changeImage5(){
    document.c_pic3.src="img/menu_tyo-b.jpg";
}
function changeImage6(){
    document.c_pic3.src="img/menu_tyo.jpg";
}
function changeImage7(){
    document.c_pic4.src="img/menu_hatu-b.jpg";
}
function changeImage8(){
    document.c_pic4.src="img/menu_hatu.jpg";
}
function changeImage9(){
    document.c_pic5.src="img/menu_iroha-b.jpg";
}
function changeImage10(){
    document.c_pic5.src="img/menu_iroha.jpg";
}
function changeImage11(){
    document.c_pic6.src="img/menu_blog-b.jpg";
}
function changeImage12(){
    document.c_pic6.src="img/menu_blog.jpg";
}
function changeImage13(){
    document.c_pic7.src="img/menu_qa-b.jpg";
}
function changeImage14(){
    document.c_pic7.src="img/menu_qa.jpg";
}
function changeImage15(){
    document.c_pic8.src="img/iroha_banner-b.jpg";
}
function changeImage16(){
    document.c_pic8.src="img/iroha_banner.jpg";
}