This works: 

var options = {packages:['corechart'],callback:drawChart}
      google.load('visualization', '1.0', options);

replacing the example method of doing the callback:

     // Set a callback to run when the Google Visualization API is loaded.     
/* inside web2py ajax = True LOAD, this results in an empty DOM */
      google.setOnLoadCallback(drawChart);


thanks 
to 
http://stackoverflow.com/questions/5300550/google-load-causes-empty-dom-screen

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