var xmlHttpObject = false;
if (typeof XMLHttpRequest != 'undefined') 
{
    xmlHttpObject = new XMLHttpRequest();
}
if (!xmlHttpObject) 
{
    try 
    {
        xmlHttpObject = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e) 
    {
        try 
        {
            xmlHttpObject = new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch(e) 
        {
            xmlHttpObject = null;
        }
    }
}
function loadContent1(speise)
{   xmlHttpObject.open("get","speisekarte.php?speisetag="+ speise +"");
    xmlHttpObject.onreadystatechange = handleContent1;
    xmlHttpObject.send(null);
    return false;
}
function handleContent1()
{
    if (xmlHttpObject.readyState == 4)
    {
        document.getElementById('mySpeise').innerHTML = xmlHttpObject.responseText;
    }
}

function unloadContent()
{
javascript:document.getElementById('mySpeise').style.visibility='hidden';
}