Something

    makeRequest: function(ev) {
//         alert("change");
        var form = $('home_search');
        var self = this;
        var ajax_url =  $('hidden_link').get('href');
        this.request = new Request.JSON({
            method: 'get',
            url: ajax_url,
            onRequest: function() {},
            onComplete: function(ev) {
                var trips = $$('.grid_view')[0].getElement('.grid_trips');
                if (trips)
                    trips.dispose();
                var d = new Element('div', { 'html': ev.grid, 'class': 'grid_trips' });
                d.inject($$('.grid_view')[0]);
                url = $$('.hidden_marker').get('src');
                adventure_map = new HomeMapMarkers($$(".adventure_map_canvas")[0],{
                    marker_url: url,
                    trips: ev.trips
                });
                adventure_map = adventure_map.map
                google.maps.event.trigger(adventure_map, 'resize');
                new_latlng = new google.maps.LatLng(27.4116947375871760, 78.1781796875000055);
                adventure_map.setCenter(new_latlng);
            },
        });
        this.hello.delay(2000, this);
    },
    hello: function() {
        var form = $('home_search');
        this.request.send(form);
        console.log('ASreedh is great');
    }
    
});