fix this code - underlying google map not appearing

Please see attached code and also live version at http://stg-cth-1.us-west-1.elasticbeanstalk.com/advanced_search/map_picker?f=search_result&locationType=tabid_mls_area&keywords=&North=&South=&East=&West=&PriceLow=0&PriceHigh=&Bedrooms=1&Baths=1&minGarageSize=&minSize=&maxStories=&minYearBuilt=&maxYearBuilt=&maxFees=&availableOnly=1&unitNumber=&city=&county=SAN+DIEGO&county=SAN+DIEGO&SITEBRAND=CTH

Something has happened which is preventing the map layer from displaying. This worked fine before and then stopped working a few months ago.

Please fix the code so that it shows the google map in the lower layer (below the drawing layer where the boundaries are shown).