function hide() { 
document.getElementById("atable").style.visibility="hidden";
}
function show() {
document.getElementById("atable").style.visibility="visible";
}
function hide1() {
document.getElementById("atable1").style.visibility="hidden";
}
function show1() {
document.getElementById("atable1").style.visibility="visible";
}
function hide2() {
document.getElementById("atable2").style.visibility="hidden";
}

function show2() {
document.getElementById("atable2").style.visibility="visible";
}

function hide3() {
document.getElementById("atable3").style.visibility="hidden";
}
function show3() {
document.getElementById("atable3").style.visibility="visible";
}
 
function hide4() {
document.getElementById("atable4").style.visibility="hidden";
}
function show4() {
document.getElementById("atable4").style.visibility="visible";
}

 function hide5() {
document.getElementById("atable5").style.visibility="hidden";
}
function show5() {
document.getElementById("atable5").style.visibility="visible";
}

function hide_sub() {
document.getElementById("atable6").style.visibility="hidden";
document.getElementById("atable").style.visibility="hidden";
}
function show_sub() {
document.getElementById("atable6").style.visibility="visible";
document.getElementById("atable").style.visibility="visible";
}

function hide_sub1() {
document.getElementById("atable7").style.visibility="hidden";
document.getElementById("atable").style.visibility="hidden";
}
function show_sub1() {
document.getElementById("atable7").style.visibility="visible";
document.getElementById("atable").style.visibility="visible";
}

function hide_sub2() {
document.getElementById("atable8").style.visibility="hidden";
document.getElementById("atable1").style.visibility="hidden";
}
function show_sub2() {
document.getElementById("atable8").style.visibility="visible";
document.getElementById("atable1").style.visibility="visible";
}