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