function toggleClassInfo(eId) {
	var e = document.getElementById(eId);
	var img = document.getElementById(eId + "_img");

    if(e.style.display == "block") {
        e.style.display = "none";
		img.src = "/images/arrow-up.gif";
    }
    else {
        e.style.display = "block";
		img.src = "/images/arrow-down.gif";
    }
}