function count_total() {
    var count = 0;
    
    var inputs = document.getElementsByTagName('input');
    var re = new RegExp("^count_([0-9])+");
    for (var i = 0; i < inputs.length; i++) {
        if (inputs[i].id.match(re)) {
            count++;    
        }
    }
    
    sum = 0;
    sum_eur = 0;
    for (var i = 1; i <= count; i++) {
        total = $("count_" + i).value * $("price_" + i).innerHTML;
        total_eur = $("count_" + i).value * $("price_eur_" + i).innerHTML;
        $("total_" + i).innerHTML = total;
        $("total_eur_" + i).innerHTML = total_eur.toFixed(2);
        sum += total;
        sum_eur += total_eur;
    }
    
    $("sum").innerHTML = sum;
    $("sum_eur").innerHTML = sum_eur.toFixed(2);
}