window.addEventListener('load' , function (){

var metaData = document.head.children;
var metaLength = metaData.length;
var mapsApiKey = '';
for(var i = 0;i < metaLength;i++){
	var propertyName = metaData[i].getAttribute('name');
	if( propertyName === 'c2googleMapsApiKey'){
		mapsApiKey = metaData[i].getAttribute('content');
	}
}

/* for googleAPI Key exists */
if( mapsApiKey.length > 0 ){
	function initialize50() {
		var latlng50 = new google.maps.LatLng(34.71641, 137.73024);
		var pan=50;

		var myOptions50 = {
				zoom: 16,
				center: latlng50,
				mapTypeId: google.maps.MapTypeId.ROADMAP
		};

		//centering
		if( document.getElementById(pan).children.length == 1 )
		{
			if( document.getElementById(pan).children[0].children[0].tagName == 'BR'  ) 
			{
			var gmapDiv = document.getElementById(pan).children[0].children[3].children[0]
			}
			else
			{
			var gmapDiv = document.getElementById(pan).children[0].children[2].children[0]
			}
		}
		else
		{
			//beforeBR
			if( document.getElementById(pan).children[0].tagName == 'BR'  )
			{
			var gmapDiv = document.getElementById(pan).children[3].children[0]
			}
			else
			{
			var gmapDiv = document.getElementById(pan).children[2].children[0]
			}
		}
		var google_map50 = new google.maps.Map(
											gmapDiv,
											myOptions50
		);
		var marker50 = new google.maps.Marker({ position: latlng50, map: google_map50 }) 
	}

	initialize50();

/* for googleAPI Key not exists(openStreetMap) */
}else{
	var attr = document.getElementById(50);
	attr = attr.getElementsByTagName('center');
	attr = attr[0].getElementsByTagName('div');
	attr[0].setAttribute('id' , 'openStreetMap50');

	var map50 = L.map( 'openStreetMap50' ).setView([34.71641,137.73024], 17 );

	var tileLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',{
		attribution: '(c) <a href="http://osm.org/copyright">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>',
		maxZoom: 19
	});
	tileLayer.addTo(map50);
	L.marker([34.71641,137.73024]).addTo(map50);
}
});