function validateDownloadForm()
{
    document.getElementById("fsync-download-1-error").style.display = "none";
    document.getElementById("fsync-download-2-error").style.display = "none";

    if(document.getElementById("input-date-start").value == '')
    {
        //document.getElementById('input-date-stop').value = new Date().toDateInputValue();
        document.getElementById("fsync-download-1-error").style.display = "block";
        return false;
    }

    if(document.getElementById("input-date-start").value > document.getElementById("input-date-stop").value)
    {
        //document.getElementById('input-date-stop').value = new Date().toDateInputValue();
        document.getElementById("fsync-download-2-error").style.display = "block";
        return false;
    }

    return true;
}


function submitDownloadForm()
{
    if(validateDownloadForm()) 
    { 
        document.getElementById('download_log_form').submit();
    }
}

function clearLog()
{
	document.getElementById('clear_btn').classList.remove('btn-blue');
	document.getElementById('clear_btn').innerHTML = '<img src="View/img/loader.gif" />';
    	document.getElementById('clear_log_form').submit();
}

function checkLatestVersion()
{
    var xhttp;
    xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            if( this.responseText != '')
            {
                document.getElementById("check_latest_version_result").innerHTML = this.responseText;
            }
        }
    };

    xhttp.open("GET", "ajax.php?random=" + Math.random() + "&action&action=checkLatestVersion",true);
    xhttp.send();  
}