function removePromo(g) { var F=document.forms.theForm; var field=F.promo; if (g=='pre') field=F.pre_promo; if (g=='ebook') field=F.ebook_promo; if (g=='iprint') field=F.iprint_promo; field.value='**delete**'; submit('update') }
  function updateCart() { submit('update') }
  function checkout() { submit('checkout'); }
  function submit(cmd) { var F=document.forms.theForm; F.cmd.value=cmd; F.submit(); }
  function deleteItem(id) { var F=document.forms.theForm; F['qty_'+id].value=0; updateCart(); }
  function useCredits() { document.forms.theForm.credits.value='yes'; updateCart(); }
  function next() { submit('next'); }