how to use google map in master page file using drop down

hi,

how to change the location on google map using drop down selected index changed event in master page file....

the below script successfully executed in default page but not working on master page on content page. The google map show but not change the city in dropdown selected index.

src = "http://code.jquery.com/jquery-1.9.1.js";

src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=false";

$(document).ready(function () {

var gmarkers = [];

var map;

function initialize() {

var mapProp = {

center: new google.maps.LatLng(20.593684, 78.96288), //India Lat and Lon

zoom: 2,

mapTypeId: google.maps.MapTypeId.ROADMAP

};

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

}

google.maps.event.addDomListener(window, 'load', initialize);

$("#ddcity1").change(function () {

var city = $("#ddcity1").val();

var geocoder = new google.maps.Geocoder();

var com = city;

geocoder.geocode({ 'address': com }, function (results, status) {

if (status == google.maps.GeocoderStatus.OK) {

var x = results[0].geometry.location.lat();

var y = results[0].geometry.location.lng();

var latlng = new google.maps.LatLng(x, y);

var myOptions = {

zoom: 8,

center: latlng,

mapTypeId: google.maps.MapTypeId.ROADMAP

};

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

var marker = new google.maps.Marker({

position: new google.maps.LatLng(x, y),

map: map,

title: com

});

var infowindow = new google.maps.InfoWindow({

content: com

});

infowindow.open(map, marker);

google.maps.event.addDomListener(window, 'load');

} else {

res.innerHTML = "Enter correct Details: " + status;

}

});

plz help me how to change the city in drop down event in content page