function expand(id) {
	var plus = "plus_" + id;
	var minus = "minus_" + id;
	var detail = "details_" + id;
	document.getElementById(plus).style.display = 'none';
	document.getElementById(minus).style.display = 'block';
	document.getElementById(detail).style.display = 'block';
}

function collapse(id) {
	var plus = "plus_" + id;
	var minus = "minus_" + id;
	var detail = "details_" + id;
	document.getElementById(plus).style.display = 'block';
	document.getElementById(minus).style.display = 'none';
	document.getElementById(detail).style.display = 'none';
}