function show_citymap() {
	var bt = document.getElementById('bottomtext');
	var cm = document.getElementById('citymap');
	if (cm)
		return;

	if (bt) {
		cm = document.createElement('img');
		cm.setAttribute('id', 'citymap');
		cm.setAttribute('src', 'imgs/citymap.png');
		cm.setAttribute('alt', 'Citymap');
		cm.setAttribute('onmouseout', 'hide_citymap()');
		bt.parentNode.insertBefore(cm, bt);
	}
}

function hide_citymap() {
	var cm = document.getElementById('citymap');
	if (cm) {
		cm.parentNode.removeChild(cm);
	}
}