function showFloor(id) {
	var i, elm, elements;
	elements = $('floors').getElementsByTagName("div");
	for( i=0, elm; elm=elements.item(i++); )	{
		if (elm.id == "floor_" + id) {
			elm.style.display = 'block';
		} else {
			elm.style.display = 'none';
		}
	}
}