function show_div(div_id_top) {
    // hide all the divs
    document.getElementById('the_div_1').style.display = 'none';
    document.getElementById('the_div_2').style.display = 'none';
 
    // show the requested div
    document.getElementById(div_id_top).style.display = 'block';
}

function show_div2(div_id_results) {
    // hide all the divs
    document.getElementById('the_div_3').style.display = 'none';
    document.getElementById('the_div_4').style.display = 'none';
 
    // show the requested div
    document.getElementById(div_id_results).style.display = 'block';
}