function showimage_12() {
document.getElementById('div_pic_12').style.visibility='visible';
}

function hideimage_12() {
document.getElementById('div_pic_12').style.visibility='hidden';
}

function showimage_13() {
document.getElementById('div_pic_13').style.visibility='visible';
}

function hideimage_13() {
document.getElementById('div_pic_13').style.visibility='hidden';
}

function showimage_14() {
document.getElementById('div_pic_14').style.visibility='visible';
}

function hideimage_14() {
document.getElementById('div_pic_14').style.visibility='hidden';
}

function showimage_22() {
document.getElementById('div_pic_22').style.visibility='visible';
}

function hideimage_22() {
document.getElementById('div_pic_22').style.visibility='hidden';
}

function showimage_23() {
document.getElementById('div_pic_23').style.visibility='visible';
}

function hideimage_23() {
document.getElementById('div_pic_23').style.visibility='hidden';
}

function showimage_24() {
document.getElementById('div_pic_24').style.visibility='visible';
}

function hideimage_24() {
document.getElementById('div_pic_24').style.visibility='hidden';
}

function showimage_32() {
document.getElementById('div_pic_32').style.visibility='visible';
}

function hideimage_32() {
document.getElementById('div_pic_32').style.visibility='hidden';
}

function showimage_33() {
document.getElementById('div_pic_33').style.visibility='visible';
}

function hideimage_33() {
document.getElementById('div_pic_33').style.visibility='hidden';
}

function showimage_34() {
document.getElementById('div_pic_34').style.visibility='visible';
}

function hideimage_34() {
document.getElementById('div_pic_34').style.visibility='hidden';
}