$(function(){
    recalculate();
});

function recalculate() {
    var sum = 0;
    var tmp = 0;
    var thisVal = 0;
    $("input[rel^='count_']").each(function(){
        var name = $(this).attr('rel').substring(6);
        tmp = $('#price_' + name).val();
        thisVal = $(this).val();
        if (tmp == '') {tmp = 0};
        if (thisVal == '') {thisVal = 0};
        
        sum = sum - ( - parseFloat(tmp) * parseFloat(thisVal));
    });
    if (sum == 'NaN') sum = 0;
    $('#totalPrice').html(Math.round((sum*100))/100);
    $('#iTotalPrice').val(Math.round((sum*100))/100);
}