How to execute a JS in global scope?

I created one OpenLayers widget with the help of Wt. and I do some
javascript in it

    std::stringstream ss;
    ss << "var map = new OpenLayers.Map('" + id() + "');"
      "var osm = new OpenLayers.Layer.OSM();"
      "map.addLayer(osm);"
      "map.zoomToMaxExtent();";
    doJavaScript(ss.str());


I want variable map to be accessed in a js function from anywhere in the
application?
Is this possible?
-- 
Regards,
   Mohammed Rashad K M
   M.S. (By Research) student
   Lab for Spatial Informatics
   Department of CSE
   International Institute of Information Technology
   Hyderabad, India
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