function showSub1() {
document.getElementById("navSub1").style.visibility="visible";
document.getElementById("navSub2").style.visibility="hidden";
document.getElementById("navSub3").style.visibility="hidden";
document.getElementById("navSub4").style.visibility="hidden";
document.getElementById("navSub5").style.visibility="hidden";
document.getElementById("navSub6").style.visibility="hidden";
//document.getElementById("navSub7").style.visibility="hidden";
}

function showSub2() {
document.getElementById("navSub1").style.visibility="hidden";
document.getElementById("navSub2").style.visibility="visible";
document.getElementById("navSub3").style.visibility="hidden";
document.getElementById("navSub4").style.visibility="hidden";
document.getElementById("navSub5").style.visibility="hidden";
document.getElementById("navSub6").style.visibility="hidden";
//document.getElementById("navSub7").style.visibility="hidden";
}

function showSub3() {
document.getElementById("navSub1").style.visibility="hidden";
document.getElementById("navSub2").style.visibility="hidden";
document.getElementById("navSub3").style.visibility="visible";
document.getElementById("navSub4").style.visibility="hidden";
document.getElementById("navSub5").style.visibility="hidden";
document.getElementById("navSub6").style.visibility="hidden";
//document.getElementById("navSub7").style.visibility="hidden";
}

function showSub4() {
document.getElementById("navSub1").style.visibility="hidden";
document.getElementById("navSub2").style.visibility="hidden";
document.getElementById("navSub3").style.visibility="hidden";
document.getElementById("navSub4").style.visibility="visible";
document.getElementById("navSub5").style.visibility="hidden";
document.getElementById("navSub6").style.visibility="hidden";
//document.getElementById("navSub7").style.visibility="hidden";
}

function showSub5() {
document.getElementById("navSub1").style.visibility="hidden";
document.getElementById("navSub2").style.visibility="hidden";
document.getElementById("navSub3").style.visibility="hidden";
document.getElementById("navSub4").style.visibility="hidden";
document.getElementById("navSub5").style.visibility="visible";
document.getElementById("navSub6").style.visibility="hidden";
//document.getElementById("navSub7").style.visibility="hidden";
}

function showSub6() {
document.getElementById("navSub1").style.visibility="hidden";
document.getElementById("navSub2").style.visibility="hidden";
document.getElementById("navSub3").style.visibility="hidden";
document.getElementById("navSub4").style.visibility="hidden";
document.getElementById("navSub5").style.visibility="hidden";
document.getElementById("navSub6").style.visibility="visible";
//document.getElementById("navSub7").style.visibility="hidden";
}

function showSub7() {
document.getElementById("navSub1").style.visibility="hidden";
document.getElementById("navSub2").style.visibility="hidden";
document.getElementById("navSub3").style.visibility="hidden";
document.getElementById("navSub4").style.visibility="hidden";
document.getElementById("navSub5").style.visibility="hidden";
document.getElementById("navSub6").style.visibility="hidden";
//document.getElementById("navSub7").style.visibility="visible";
}