function submitLogin() {
    var emailAddress = checkEmptyField(document.getElementById('j_username').value);
    var password = checkEmptyField(document.getElementById('j_password').value);
    if (emailAddress == '') {
	document.getElementById('emailAddressRequired').style.display = 'block';
    } else {
	document.getElementById('emailAddressRequired').style.display = 'none';
    }
    if (password == '') {
	document.getElementById('passwordRequired').style.display = 'block';
    } else {
	document.getElementById('passwordRequired').style.display = 'none';
    }
    if (emailAddress != '' && password != '') {
	document.yoForm.submit();
    }
}

function checkEnter(element, event) {
    if (event.keyCode == 13) {
    	submitLogin();
    }
}