function appendInput() {
    var m = "New Element";
    var n = document.createElement("li");
    n.appendChild(document.createTextNode(m));
    document.getElementById("fieldset").appendChild(n); 
}

function getUsername ()
{
    var requestUrl = '/auth/getusername';
    var email = document.getElementById("email").value;
	var psswd = document.getElementById("password").value;
	try
    {
		var request = new Ajax.Request(
            requestUrl,
            {
                method: 'post',
				parameters: {eml: encodeURIComponent(email), psswd: encodeURIComponent(psswd)},
				onComplete: setUsername
            }
        );
    }
    catch (e)
    {
    	alert('Error: ' + e.toString());
    }
}

function setUsername (reply)
{
    var userNameReply = eval('(' + reply.responseText + ')');
    var rowCount = userNameReply.length;
	if (rowCount == 1) {
                userName = userNameReply[0].username;
				document.getElementById("username").value = userName;
				document.forms['loginForm'].submit();				
    } else {
		alert ('Nesprávné přihlašovací údaje!');
	}
}