function add(wwwroot, id, n)
{
    n = (typeof n == 'undefined') ? 1 : n;

    var xmlhttp = createXMLHTTPObject();
    xmlhttp.open("GET", '/_add.php?id='+id+'&n='+n, false);
    xmlhttp.send(null);

    if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
    {
        document.getElementById('jobb-megrendeles').innerHTML = xmlhttp.responseText;
        
        if(document.getElementById('darab_'+id))
        {
			if(document.getElementById('db_'+id)) 
			{
				document.getElementById('darab_'+id).value = parseInt(document.getElementById('db_'+id).innerHTML);
			}
			else
			{
				document.getElementById('darab_'+id).value = '';
			}
		}
    }
    else
    {
        alert(xmlhttp.responseText);
    }
}

function del(wwwroot, id)
{
    add(wwwroot, id, -1);
}