function setupLogin() {
	var username = document.getElementById('username');
	var password = document.getElementById('password');
	
	if(username != null && username.type != 'hidden') {
		addEvent(username, 'blur', check_password_validity);
		username.focus();
	}
	if(password != null) {
		addEvent(password, 'blur', check_password_validity);
	}

}

// function to add events to the page in a cross-browser manner
function addEvent(objObject, strEventName, fnHandler) { 
	// DOM-compliant way to add an event listener 
 	if (objObject.addEventListener) {
		objObject.addEventListener(strEventName, fnHandler, false); 
	}
	// IE/windows way to add an event listener 
	else if (objObject.attachEvent) {
		objObject.attachEvent('on' + strEventName, fnHandler); 
	}
}


function check_password_validity() {
	var username = document.getElementById('username').value;
	var errDiv = document.getElementById('login_response');
	var password = document.getElementById('password').value;
	if(password) {
		encode_password(false);
	}
	var encpassword = document.getElementById('salted_encoded_password').value;
	var seedID = document.getElementById('seed_id').value;
	
	if(username && encpassword && seedID) {
		var params = 'task=pwcheck&username='+username+'&encpassword='+encpassword+'&seedid='+seedID;
		new Ajax.Request(pathPrefix + 'loginWorker.php', {
				parameters: encodeURI(params),
				asynchronous:true,
				onSuccess: function(transport) {
					errDiv.innerHTML = transport.responseText;
				}
			});
	}else if((!username && password) || (!password && username)) {
		errDiv.innerHTML = '';
	}else if(!username && !password) {
		errDiv.innerHTML = "";
	}else{
		errDiv.innerHTML = "Required field missing";
	}
}

addEvent(window,'load',setupLogin);