function checkcode(errmsg) {
   if ( ( window.search_global_flag && (document.forms['searchform'].kod.value.length < 3) && (document.forms['searchform'].nazev.value.length < 3))
        || ( (! window.search_global_flag) && (document.forms['searchform'].kod.value.length <= 0) && (document.forms['searchform'].nazev.value.length <= 0) && (! document.forms['searchform'].skladem || (document.forms['searchform'].skladem && (! document.forms['searchform'].skladem.checked))) && (document.forms['searchform'].cenaod.value.length <= 0) && (document.forms['searchform'].cenado.value.length <= 0)) ) {
      alert(errmsg);
      return false;
      }
   return true;
   }