Navigator = new function() {
  var _findForm = function(formName) {
    return eval('document.'+formName) ? eval('document.'+formName) : Doc.findObj(formName);
  }//_findForm

  this.setUrlAndGo = function(formName, letter) {
    var formRef = _findForm(formName);
    var params = '';
    var selectedType = "";
    if(formRef.types) selectedType = formRef.types.options[formRef.types.selectedIndex].value;
    if(selectedType!='') params+=(params.length>0 ? '&' : '')+'Rodzaj='+selectedType;
    if(typeof letter!='undefined') params+=(params.length>0 ? '&' : '')+'Litera='+letter;
    var url = formRef.url.value+'?'+params;
    document.location.href = url;
  }//setUrlAndGo
}//Navigator