JS Google Maps Inject Custom Data/Loc SRC

<html>
<script
src="http://maps.googleapis.com/maps/api/js">
</script>

<script>
var p=prompt("Ener Latitude:");
var p1=prompt("Enter Longitude");
var myCenter=new google.maps.LatLng(p,p1);

function initialize()
{
var mapProp = {
center:myCenter,
zoom:5,
mapTypeId:google.maps.MapTypeId.HYBRID
};

var map=new google.maps.Map(document.getElementById("googleMap"),mapProp);

var marker=new google.maps.Marker({
position:myCenter,
});

marker.setMap(map);


var msg = prompt("Enter String:");
var infowindow = new google.maps.InfoWindow({
content:msg
});

infowindow.open(map,marker);
}

google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<div id="googleMap" style="width:500px;height:380px;"></div>
</body>
</html>