function init() 
{
    var u = document.getElementById("username");
    u.focus();
    if (u.value != null && u.value.length > 0)
        u.select();
}

function isValid()
{
    var u = document.getElementById("username");
    var p = document.getElementById("password");
    var e = document.getElementById("errors");

    //document.getElementById("login_btn_div").innerHTML = "Authenticating...";

    if (u == null || u.value.length <= 0) {
        e.innerHTML = "<div class=\"error\">Username cannot be empty.</div>";
        return false;
    }
    else if ( p == null || p.value.length <= 0) {
        e.innerHTML = "<div class=\"error\">Password cannot be empty.</div>";
        return false;
    }
    return true;
}