var errfound = false;
function ValidLength(item, len) {
   return (item.length >= len);
}
function trim(s) {
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))  {
    s = s.substring(1,s.length);
  }
  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))  {
    s = s.substring(0,s.length-1);
  }
  return s;
}
function error(elem, text) {
   if (errfound) return;
   window.alert(text);
   if((elem.type == 'text')||(elem.type == 'password')) elem.select();
   elem.focus();
   errfound = true;
}

function form_control_soucet_krmivo(form, field) {
    soucet = parseInt(field.value) + parseInt(form.form_wiboform_suche_krmivo.value);
    if(field.value != '' && form.form_wiboform_suche_krmivo.value != '' && soucet != 100) {
        return false;
    }
    return true;
}

function form_control_soucet_znacky(form, field) {
    soucet = parseInt(field.value) + parseInt(form.form_wiboform_pedigree.value);
    if(field.value != '' && form.form_wiboform_pedigree.value != '' && soucet != 100) {
        return false;
    }
    return true;
}

function form_control_jine_znacky(form, field) {
    if(field.value == '' && form.form_wiboform_jine_znacky.value && form.form_wiboform_jine_znacky.value != '0') {
        return false;
    }
    return true;
}