rewrite loader.js in coffeescript

app/assets/javascripts/loader.js

-var Loader = { 
-  img_src: "/assets/ajax-loader.gif", 
-
-  html: 
-    function(width) { 
-      img = $("<img>");
-      img.attr("width", width);
-      img.attr("src", this.img_src);
-      return img;
-    }
-}

app/assets/javascripts/loader.js.coffee

+Loader =
+  html: (width) ->
+    $('<img>').attr src: '/assets/ajax-loader.gif', width: width
+
+window.Loader = Loader