function show()
{
document.getElementById('hidden').style.visibility="visible"
}

function hide() {
document.getElementById('hidden').style.visibility="hidden"
} 

function show2()
{
document.getElementById('hidden2').style.visibility="visible"
}

function hide2() {
document.getElementById('hidden2').style.visibility="hidden"
} 

function show3()
{
document.getElementById('hidden3').style.visibility="visible"
}

function hide3() {
document.getElementById('hidden3').style.visibility="hidden"
} 

function show_index()
{
document.getElementById('hidden_index').style.visibility="visible"
}

function hide_index() {
document.getElementById('hidden_index').style.visibility="hidden"
}