function pas() {
document.getElementById("ident").style.visibility="visible";
}

function pah() {
document.getElementById("ident").style.visibility="hidden";
}

function pbs() {
document.getElementById("help").style.visibility="visible";
}

function pbh() {
document.getElementById("help").style.visibility="hidden";
}

function pcs() {
document.getElementById("memb").style.visibility="visible";
}

function pch() {
document.getElementById("memb").style.visibility="hidden";
}

function pds() {
document.getElementById("study").style.visibility="visible";
}

function pdh() {
document.getElementById("study").style.visibility="hidden";
}

function pes() {
document.getElementById("ak").style.visibility="visible";
}

function peh() {
document.getElementById("ak").style.visibility="hidden";
}

function pfs() {
document.getElementById("guest").style.visibility="visible";
}

function pfh() {
document.getElementById("guest").style.visibility="hidden";
}