Can't determine this syntax

Can't determine this syntax

I'm just getting started with jQuery and I have some code working but cant understand why...

  1.         //maps
            $("#map").goMap({
                   scaleControl: true,
                maptype: 'ROADMAP',
                latitude: 40.6802778,
                longitude: -73.4555556,
                zoom: 12 
                });
               
               $.goMap.createMarker({
                   latitude: 40.6802770,
                longitude: -73.4555551,
                title: 'Ciao Baby',
                html:'Ciao Baby'
               });














In this example what does the $.goMap.createMarker syntax mean?  How does it know I want to apply this to the #map map and not #map2? 

Thanks!
Frank