function productform_allcheckboxes()
{
    var req = new XMLHttpRequest();
    req.onreadystatechange = function()
    {
        if((req.status == 200) && (req.readyState == 4))
        {
           document.getElementById("laender_check").innerHTML = req.responseText; 
        }
    }
    req.open("GET", "http://www.food-stock.de/table_checkboxen.html", true);
    req.send();  
}