function validateSyncForm()
{
    document.getElementById("fsync-datatype-error").style.display = "none";
    document.getElementById("fsync-authform-error").style.display = "none";

    if(document.getElementById("fsync_datatype").value == '')
    {
        document.getElementById("fsync-datatype-error").style.display = "block";
        return false;
    }

    if(
        document.getElementById("fsync_auth_apikey").value == '' ||
        document.getElementById("fsync_auth_username").value == '' ||
        document.getElementById("fsync_auth_password").value == '' ||
        document.getElementById("fsync_auth_fiscalcode").value == '' 
    )
    {
        document.getElementById("fsync-authform-error").style.display = "block";
        return false;
    }

    return true;
}


function submitSyncForm()
{
    if(validateSyncForm()) 
    { 
        document.getElementById('btn_sync_form').disabled = true;

        var alertboxes = document.getElementsByClassName("alert-box");
	    for (var i = 0, length = alertboxes.length; i < length; i++) {
            alertboxes[i].style.display = "none";
        }
        document.getElementById("alert-sync").style.display = "block";
        document.getElementById('sync_form').submit();
    }
}