function getHTTPObject() {
	var xhr = false;
	if(window.XMLHttpRequest) {
		xhr = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		try {
			xhr = new ActiveXObject("Msxml2.XMLHTTP");
		} catch(e) {
			try {
				xhr = new ActiveXObject("Microsoft.XMLHTTP");
			} catch(e) {
				xhr = false;
			}
		}
	}
	return xhr;
}

function sendData(email) {
	var request = getHTTPObject();
	if(request) {
		request.onreadystatechange = function() {
			parseResponse(request);
		};
		request.open( "POST", "ajax.checkEmail.php", true);
		request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		var data = "";
		data += "email=";
		data += escape(email);
		request.send(data);
		return true;
	} else {
		return false;
	}
}
function check4DuplicateEmail() {
	if(!document.getElementById) {
		return;
	}
	if(!document.getElementById("email")) {
		return;
	}
	email = document.getElementById("email").value;
	return !sendData(email);
}
function parseResponse(request) {
	duplicate = 0;
	if(request.readyState == 4) {
		if(request.status == 200 || request.status == 304) {
			if(request.responseText) {
				var container = document.getElementById("container");
				container.innerHTML = request.responseText;
				document.getElementById('email').style.border = "1px solid red";
				//duplicate = 1;
				duplicate = 1;
			} else {
				document.getElementById('email').style.border = "1px solid black";
				duplicate = 0;
			}
		}
	}
}
function clearContainer() {
	var container = document.getElementById("container");
	container.innerHTML = null;
	
}
document.getElementById("email").onblur = check4DuplicateEmail;