diff --git a/index.php b/index.php
index a2a4d9b..2149b2b 100755
--- a/index.php
+++ b/index.php
@@ -105,6 +105,7 @@ print
       var lang_newinterval = "'.$lang_newinterval.'";
       var units = "'.$units.'";
       var mapapi = "'.$mapapi.'";
+      var gkey = '.(isset($gkey)?'"'.$gkey.'"':'null').';
     </script>
     <script type="text/javascript" src="main.js"></script>     
 ';
diff --git a/main.js b/main.js
index 5fa8d19..12a2525 100755
--- a/main.js
+++ b/main.js
@@ -287,7 +287,7 @@ function loadMapAPI(api) {
 	var url = new Array();
 	if (api=='gmaps') { 
 		url.push('api_gmaps.js');
-		url.push('https://maps.googleapis.com/maps/api/js?sensor=false&callback=init'); 
+		url.push('https://maps.googleapis.com/maps/api/js?'+((gkey!==null)?('key='+gkey+'&'):'')+'sensor=false&callback=init'); 
 	}
 	else { 
 		url.push('api_openlayers.js');