function up(obj)
{
   val = parseInt(document.getElementById(obj).value);
   if(val >= 0) new_val = val + 1;
   else new_val = 0;
   document.getElementById(obj).value = new_val;
}

function down(obj)
{
   val = parseInt(document.getElementById(obj).value);
   if(val >= 0) new_val = val - 1;
   else new_val = 0;
   if(new_val < 0) new_val = 0;
   document.getElementById(obj).value = new_val;
}

function showReturnFieldOrAff()
{
   if(document.order_frm.organization)
   {
      if(document.order_frm.organization.value != '' && document.order_frm.show_return.value == 1) document.getElementById('return_date').style.display = 'block';
      else document.getElementById('return_date').style.display = 'none';
   }
}

function countPointsAff(amount)
{
   if(document.order_frm.points_number)
   {
      points = parseInt(document.order_frm.points_number.value);
      discount = parseFloat(points*amount);
      if(discount > 0)
      {
         disc = discount.toString();
         if(disc.indexOf(".") == -1) disc += '.00';
         document.getElementById('points_discount').innerHTML = 'Korting: &euro;'+disc.replace(".",",");
         document.order_frm.pdiscount.value = discount;
      }
      else
      {
         document.getElementById('points_discount').innerHTML = '';
         document.order_frm.pdiscount.value = 0;
      }
   }
}