function showImage(generated,fullw,fullh) {
  document.mainImage.src = generated
  document.mainImage.width = fullw
  document.mainImage.height = fullh
}

function amountPlusOne(field) {
document.getElementById('productOption[' + field + ']').value = (parseInt(document.getElementById('productOption[' + field + ']').value) + 1);

return false;
}

function amountMinOne(field) {
if(document.getElementById('productOption[' + field + ']').value > 0)
document.getElementById('productOption[' + field + ']').value = (parseInt(document.getElementById('productOption[' + field + ']').value) - 1);

return false;
}

function amountMinOneNoOptions(field) {
if(document.getElementById('productOption[' + field + ']').value > 1)
document.getElementById('productOption[' + field + ']').value = (parseInt(document.getElementById('productOption[' + field + ']').value) - 1);
}