Rails how change google maps marker? - ruby-on-rails

Question

hello I would change the marker in a map , i use rails and i wrote this javascript function for set marker so if i change the marker with url: "icona.png" where icona.png is locate in the same folder of the resource promotions no show me the marker on map. Why? how change the default market there is another method?
function setMarkers(map, locations) {
// Add markers to the map
// Marker sizes are expressed as a Size of X,Y
// where the origin of the image (0,0) is located
// in the top left of the image.
// Origins, anchor positions and coordinates of the marker
// increase in the X direction to the right and in
// the Y direction down.
var image = {
url: "icona.png",
// This marker is 20 pixels wide by 32 pixels tall.
size: new google.maps.Size(20, 32),
// The origin for this image is 0,0.
origin: new google.maps.Point(0,0),
// The anchor for this image is the base of the flagpole at 0,32.
anchor: new google.maps.Point(0, 32)
};
var shadow = {
url: "icona.png",
// The shadow image is larger in the horizontal dimension
// while the position and offset are the same as for the main image.
size: new google.maps.Size(37, 32),
origin: new google.maps.Point(0,0),
anchor: new google.maps.Point(0, 32)
};
// Shapes define the clickable region of the icon.
// The type defines an HTML <area> element 'poly' which
// traces out a polygon as a series of X,Y points. The final
// coordinate closes the poly by connecting to the first
// coordinate.
var shape = {
coord: [1, 1, 1, 20, 18, 20, 18 , 1],
type: 'poly'
};

Answer 1

Try to put javascript in app/assets/javascripts/ and marker in app/assets/images/ folder. Then route to image: "/assets/marker.png"
You can read more there http://guides.rubyonrails.org/asset_pipeline.html