trying to set up a OSM map with a marker

gistfile1.clj

;; The problem is that the text in :element of over-lay gets interpreted as text, not really
;; surprising at the moment as it is text, but I don't know what to do with it so that it
;; works like in the example: http://artarmstrong.com/blog/2014/10/28/openlayers-3-custom-markers-by-latitude-longitude/

(ns clojurescript-apis.core
  (:require-macros [hiccups.core :as h]
                   [cljs.core.async.macros :as m :refer [go alt!]])
  (:require [clojure.browser.repl :as repl]
            [domina :as dom]
            [hiccups.runtime :as hiccupsrt]
            [ajax.core :refer [GET POST]]
            [cljs.core.async
             :as async
             :refer [<! >! chan close! sliding-buffer put! alts! timeout]]
            ol.Map
            ol.layer.Tile
            ol.layer.Vector
            ol.source.OSM
            ol.source.Vector
            ol.View
            ol.proj
            ol.control.FullScreen
            ol.style.Style
            ol.style.Fill
            ol.style.Circle
            ol.style.Stroke
            ol.Overlay))


(defn init-map []
  (println "this is my map code!!!!")
  (let [source (ol.source.OSM. #js {:layer "osm"})
        raster (ol.layer.Tile. #js {:source source})
        view (ol.View. #js {:center #js [37.41, 8.82]
                            :zoom 4
                            :maxZoom (get props :max-zoom 18)})
        over-lay (ol.Overlay.
                  #js {:position (ol.proj.transform #js [-122.332071, 47.606209] ,
                                                         "EPSG:4326","EPSG:3857" )
;;;
;;;  the next line should be equivalent to element: $('<img src="/img/marker.png">') but isn't at the moment.
;;;  At the moment it is just text.
;;;
                       :element "<img src=\"/img/marker.png\">"}) 
        map (ol.Map. #js {:layers #js [raster]
                          :target "demoMap"
                          :view   view})]
    (.addOverlay map over-lay ))
    (println "done mapping..."))