var counter = 0

function showRow(product) {
    if (document.getElementById(product).checked == true ) {
        document.getElementById('header_row').style.display='block'
        document.getElementById('footer_row').style.display='block'
        document.getElementById(product + '_row').style.display='block'
        counter++
    }
    else {
        document.getElementById(product + '_row').style.display='none'
        counter--
        if (counter == 0) {
            // No products checked - hide product table header/footer
            document.getElementById('header_row').style.display='none'
            document.getElementById('footer_row').style.display='none'
        }
    }
}

function submitPair(productRow) {
    var row = document.getElementById(productRow)
    var inputs = row.getElementsByTagName('input')
    if (!inputs[0].value) {
        inputs[0].value = 1
    }
    inputs[1].value = inputs[0].value
    document.prodform.submit();
}

function submitAll() {
    for (var i = 1; i <= 12; i++) {
        var row = document.getElementById('combo' + i + '_row')
        var inputs = row.getElementsByTagName('input')
        if (inputs[0].value) {
            inputs[1].value = inputs[0].value
        }
    } 
    document.prodform.submit();
}