Помогите зациклить следующую запись, а то монотонно приходится копировать.

function getSumdobor0()
{
 var piece_dobor0 = parseFloat(document.getElementById('piece_dobor0').value);
 var price_dobor0 = parseFloat(document.getElementById('price_dobor0').value);
 return document.getElementById('sum_dobor0').value = piece_dobor0 * price_dobor0;
}

что б не писать каждый раз вот так:

function getSumdobor0()
{
 var piece_dobor0 = parseFloat(document.getElementById('piece_dobor0').value);
 var price_dobor0 = parseFloat(document.getElementById('price_dobor0').value);
 return document.getElementById('sum_dobor0').value = piece_dobor0 * price_dobor0;
}
function getSumdobor1()
{
 var piece_dobor1 = parseFloat(document.getElementById('piece_dobor1').value);
 var price_dobor1 = parseFloat(document.getElementById('price_dobor1').value);
 return document.getElementById('sum_dobor1').value = piece_dobor1 * price_dobor1;
}
function getSumdobor2()
{
 var piece_dobor2 = parseFloat(document.getElementById('piece_dobor2').value);
 var price_dobor2 = parseFloat(document.getElementById('price_dobor2').value);
 return document.getElementById('sum_dobor2').value = piece_dobor2 * price_dobor2;
}
function getSumdobor3()
{
 var piece_dobor3 = parseFloat(document.getElementById('piece_dobor3').value);
 var price_dobor3 = parseFloat(document.getElementById('price_dobor3').value);
 return document.getElementById('sum_dobor3').value = piece_dobor3 * price_dobor3;
}
function getSumdobor4()
{
 var piece_dobor4 = parseFloat(document.getElementById('piece_dobor4').value);
 var price_dobor4 = parseFloat(document.getElementById('price_dobor4').value);
 return document.getElementById('sum_dobor4').value = piece_dobor4 * price_dobor4;
}