function switchNote(obj, elem) {
	if (document.getElementById) {
		var imageName = "../images/pre_reg/"+obj.name+"_black.gif";
		var el = document.getElementById(elem);
		var ar = document.getElementById("note").getElementsByTagName("DIV");
		if (el.style.display == "none") {
			for (var i=0; i<ar.length; i++){
				ar[i].style.display = "none";
				if (elem == "one") {
					document.getElementById("icon2").src = "../images/pre_reg/icon2.gif";
					document.getElementById("icon3").src = "../images/pre_reg/icon3.gif";
					document.getElementById("icon4").src = "../images/pre_reg/icon4.gif";
					document.getElementById("icon5").src = "../images/pre_reg/icon5.gif";
				}
				else if (elem == "two") {
					document.getElementById("icon1").src = "../images/pre_reg/icon1.gif";
					document.getElementById("icon3").src = "../images/pre_reg/icon3.gif";
					document.getElementById("icon4").src = "../images/pre_reg/icon4.gif";
					document.getElementById("icon5").src = "../images/pre_reg/icon5.gif";
				}
				else if (elem == "three") {
					document.getElementById("icon1").src = "../images/pre_reg/icon1.gif";
					document.getElementById("icon2").src = "../images/pre_reg/icon2.gif";
					document.getElementById("icon4").src = "../images/pre_reg/icon4.gif";
					document.getElementById("icon5").src = "../images/pre_reg/icon5.gif";
				}
				else if (elem == "four") {
					document.getElementById("icon1").src = "../images/pre_reg/icon1.gif";
					document.getElementById("icon2").src = "../images/pre_reg/icon2.gif";
					document.getElementById("icon3").src = "../images/pre_reg/icon3.gif";
					document.getElementById("icon5").src = "../images/pre_reg/icon5.gif";
				}
				else if (elem == "five") {
					document.getElementById("icon1").src = "../images/pre_reg/icon1.gif";
					document.getElementById("icon2").src = "../images/pre_reg/icon2.gif";
					document.getElementById("icon3").src = "../images/pre_reg/icon3.gif";
					document.getElementById("icon4").src = "../images/pre_reg/icon4.gif";
				}
			}
			el.style.display = "block";
			obj.src = imageName;
		}
		else if (el.style.display == "block") {
			el.style.display = "block";
			obj.src = imageName;
		}
		else {
			el.style.display = "none";
		}
	}
}

function emailValidator(elem) {
	if (!validateEmail(elem)) {
		alert("This is not a valid email address");
	}
}

function validateEmail(elem) {
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if (!(elem.value.match(emailExp))) {
		return false;
	}
	return true;
}