/* Initial id in global var */
var currId = 'div_2';
//
function show_div(div_id) {
if(currId) { document.getElementById(currId).style.display = 'none'; }
currId = div_id;
document.getElementById(currId).style.display = 'block';
}
function initPage() {
var n=2;
var divEl;
while ( ( divEl = document.getElementById( "div_" + n )) !== null ) { divEl.style.display = 'none'; n++;}
}


function setVisibility(id, visibility) {
document.getElementById(id).style.display = visibility;
}
window.onload = initPage;