function toggle (obj){
	object = document.getElementById(obj)
	if(object.style.display == '')
	{
		for(i = 1; i < 5; i++) {
			document.getElementById("d"+i).style.display='';
		}
		object.style.display = 'block';
		return false;
	}
	object.style.display = '';
	return false
}