function startCalc(){
    interval = setInterval("calc()",1);
}

function calc(){
    mena = "£ ";
    var price = document.autoSumForm.base_price.value;
    var s_prints = document.autoSumForm.s_prints.value;
    var m_prints = document.autoSumForm.m_prints.value;
    var l_prints = document.autoSumForm.l_prints.value;
    var a_prints = document.autoSumForm.a_prints.value;
    var b_prints = document.autoSumForm.b_prints.value;
    var c_prints = document.autoSumForm.c_prints.value;
    var d_prints = document.autoSumForm.d_prints.value;

    var s_total = (1 * s_prints);
    var m_total = (1 * m_prints);
    var l_total = (1 * l_prints);
    var a_total = (1 * a_prints);
    var b_total = (1 * b_prints);
    var c_total = (1 * c_prints);
    var d_total = (1 * d_prints);
    var price_total = (1 * price);
    
    document.autoSumForm.s_payments.value = (s_total);
    document.autoSumForm.m_payments.value = (m_total);
    document.autoSumForm.l_payments.value = (l_total);
    document.autoSumForm.a_payments.value = (a_total);
    document.autoSumForm.a_payments.value = (b_total);
    document.autoSumForm.a_payments.value = (c_total);
    document.autoSumForm.a_payments.value = (d_total);
    document.autoSumForm.base_price.value = (price_total);

    document.autoSumForm.total.value = mena + (s_total + m_total + l_total + a_total + b_total + c_total + d_total + price_total);
    

}

function stopCalc(){
  clearInterval(interval);
}