function show(imName)
{
    var Im = document.getElementById(imName);
    Im.style.visibility = 'visible';
}

function hide(imName)
{
    var Im = document.getElementById(imName);
    Im.style.visibility = 'hidden';
}

var old_section = null;

function select(item_id)
{
    if (old_section)
    {
        deselect(old_section);
    }

    var item_a = "a" + item_id;
    var item_s = "s" + item_id;
    var item_section = "section"+item_id;
    hide(item_s);
    show(item_a);

    var Im = document.getElementById(item_section);
    Im.style.display = 'block';
    old_section = item_id;
}

function deselect(item_id)
{
    var item_a = "a" + item_id;
    var item_section = "section"+item_id;
    hide(item_a);

    var Im = document.getElementById(item_section);
    Im.style.display = 'none';
}

function openMap(mId){
	var map = document.getElementById(mId);
	if (map.className == 'mdn'){
		map.className = 'mdb';
	}
	else {
		map.className = 'mdn';
	}
}