var openDM_S = 1;
var openDM_V = 1;
var openDM_W = 1;

function DM_btn_navi_S(DMbn_S) {
document.getElementById( 'DMbtnnavi_S' + openDM_S ).style.display = 'none';
document.getElementById( 'DMbtnnavi_S' + DMbn_S ).style.display = 'block';
document.getElementById( 'DMnavi_S' + openDM_S ).style.visibility = 'hidden';
document.getElementById( 'DMnavi_S' + DMbn_S ).style.visibility = 'visible';
openDM_S = DMbn_S;
}

function DM_btn_navi_V(DMbn_V) {
document.getElementById( 'DMbtnnavi_V' + openDM_V ).style.display = 'none';
document.getElementById( 'DMbtnnavi_V' + DMbn_V ).style.display = 'block';
openDM_V = DMbn_V;
}

function DM_btn_navi_W(DMbn_W) {
document.getElementById( 'DMbtnnavi_W' + openDM_W ).style.display = 'none';
document.getElementById( 'DMbtnnavi_W' + DMbn_W ).style.display = 'block';
document.getElementById( 'DMnavi_W' + openDM_W ).style.visibility = 'hidden';
document.getElementById( 'DMnavi_W' + DMbn_W ).style.visibility = 'visible';
openDM_W = DMbn_W;
}