function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {el.style.display = 'none';}
}
function turnOn(number) {
	var el = document.getElementById('arrow'+number);
	var el2 = document.getElementById('box'+number);
	el.style.display = 'block';
	el2.style.display = 'block';
}
function turnOff(number) {
	var el = document.getElementById('arrow'+number);
	var el2 = document.getElementById('box'+number);
	el.style.display = 'none';
	el2.style.display = 'none';
}