function cdshow(){
    document.getElementById("cdtab").style.visibility="visible";
}
function cdnon(){
    document.getElementById("cdtab").style.visibility="hidden";
    //document.getElementById("cdtab").style.visibility="hidden";
}


function dvdshow(){
    document.getElementById("dvdtab").style.visibility="visible";
}
function dvdnon(){
    document.getElementById("dvdtab").style.visibility="hidden";
}


function bookshow(){
    document.getElementById("booktab").style.visibility="visible";
}
function booknon(){
    document.getElementById("booktab").style.visibility="hidden";
}


function zakkashow(){
    document.getElementById("zakkatab").style.visibility="visible";
}
function zakkanon(){
    document.getElementById("zakkatab").style.visibility="hidden";
}


function acceshow(){
    document.getElementById("accetab").style.visibility="visible";
}
function accenon(){
    document.getElementById("accetab").style.visibility="hidden";
}