$(document).ready(function(){
    setInterval('manageMainMap()', 500);
    

});

function manageMainMap(){
       var IdCityInput = $('input[name="idCity"]', '#searchBoxForm');
       var IdCity = IdCityInput.val();
       if(IdCity == ''){
           return true;
       }
       var ShowMap = '';
       if(IdCity == '31'){
          ShowMap = true;
       }else if(IdCity != ''){
           ShowMap = false;
       }
       if(ShowMap === true){
           $('#mainPageMap').show();
       }else if(ShowMap === false){
           $('#mainPageMap').hide();
       }
       return true;
}