I am trying the following. First two lines add layers from my local map service. Then I am trying to add topo map. When I do this I can't see any topo layers on the map. If I comment out code adding from local map service, I can see topo layers.
Is there something I need to do to mashup layers from different map services?
layer = new esri.layers.ArcGISDynamicMapServiceLayer(mapServiceURL); map.addLayer(layer); var layer1 = new esri.layers.ArcGISTiledMapServiceLayer("http://services.arcgisonline.com/ArcGIS/rest/services/USA_Topo_Maps/MapServer"); map.addLayer(layer1);