Javascript + rails

Hi,

I have the following code for a google map event:

@map.event_init(@map,:click,"function(overlay,point)    {      if (overlay)      {        map.removeOverlay(overlay);        document.getElementById(\"latitude\").value=null;        document.getElementById(\"longitude\").value=null;      }      else      {        map.addOverlay(new GMarker(point));        document.getElementById(\"latitude\").value=point.y;        document.getElementById(\"longitude\").value=point.x;      }    }")

As you can see, the action is written in JS. How can I call a ruby action from that code, so I can handle events properly?

Thanks, hugo