var imageClosed = new Image();
var imageOpen = new Image();

imageClosed.src = "HR_Open.jpg";
imageOpen.src = "HR_Closed.jpg";

function toggleMe(a) {
	var e=document.getElementById(a);
	var b=document.getElementById(a+'button');
	if (!e) return false;
	if (e.style.display == "none") {
		e.style.display = "block";
		b.style.backgroundImage = 'url("' + imageClosed.src + '")';
		//b.value = "-";
	} else {
		e.style.display = "none";
		b.style.backgroundImage = 'url("' + imageOpen.src + '")';
		//b.value = "+";
	}
	return false;
}