// JavaScript Document

function show_div(div_id) {
    
	var hiddenDivs = new Array();
	var allDivs = document.getElementsByTagName('div');
	
	// hide all the divs with class="hidden"
	for (i=0;i<allDivs.length;i++){
		if (allDivs[i].className == "hidden"){
		hiddenDivs[i] = allDivs[i];
		hiddenDivs[i].style.display = "none";
		}
	}
	// display the selected div
    document.getElementById(div_id).style.display = 'block';
}