function compareProducts()
{
    var url = global_path+"porownaj";
    var cnt = 0;
    $(':checkbox').each(function() {
        if (this.name.match(/^check/)) {
            if (this.checked) {
                url += "-" + this.value;
                cnt++;
            }
        }
    });
    if (cnt < 2) {
        alert("Wybierz przynajmniej dwa produkty do porównania !");
    } else {
        url += ".html";
        document.location = url;
    }
}

function showInformation(obj)
{
    var pos = findPos(obj);
    var dymek = document.getElementById('informacja');

    dymek.style.position = 'absolute';
    dymek.style.top = pos[1]-100+'px';
    dymek.style.left = pos[0]-100+'px';
    dymek.style.display='block';
}