function shopcmd_add(articleID,articlePrice,quantity) {
  shopcmd('add',articleID,articlePrice,quantity);
}
function shopcmd_remove(articleID,articlePrice,quantity) {
  shopcmd('remove',articleID,articlePrice,quantity);
}
function shopcmd_update(articleID,articlePrice,quantity) {
  shopcmd('update',articleID,articlePrice,quantity);
}
function shopcmd(shopaction,articleID,articlePrice,quantity) {
  if (articleID == null) articleID = "";
  if (articlePrice == null) articlePrice = "prijs";
  if (quantity == null) quantity = 0;
  var frm = document.frmShopCmd;
  frm.shopaction.value = shopaction;
  frm.articleID.value = articleID;
  frm.articlePrice.value = articlePrice;
  frm.quantity.value = quantity;
  frm.submit();
}
function shopcmd_empty(q) {
  if (confirm(q)) {
    var frm = document.frmShopCmd;
    frm.shopaction.value = "empty";
    frm.submit();
  }
}