Google Maps Javascript - unable to load -

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i beginner javascript , trying load simple google map in browser (firefox). however, map not load.

below html:

<!doctype html> <html> <head>   <title>can guess country?</title>   <meta charset="utf-8">   <script type="text/javascript" src="http://maps.google.com/maps/api/js?key={my_api_key}&sensor=true"></script>   <script src="mapgame.js"></script> </head> <body>   <div id="map">    </div> </body> </html>

below linked mapgame.js:

var map;  function initialize() {         var mapoptions = {         zoom: 8,                   center: new google.maps.latlng(-34.397, 150.644),             maptypeid: google.maps.maptypeid.roadmap         };         map = new google.maps.map(document.getelementbyid('map'), mapoptions);       }       google.maps.event.adddomlistener(window, 'load', initialize);

any appreciated!

probably has height of div#map, map there don't see it.

<head>   <style>     #map {       height:500px;     }   </style> </head>

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