Move user JS to page-specific script file

In this case it was difficult to eliminate interpolation
in a separate step, so I didn't bother.

app/assets/javascripts/user.js

@@ -0,0 +1,45 @@
+function init(){
+  var params = $("#map").data();
+  var map = createMap("map");
+
+  setMapCenter(new OpenLayers.LonLat(params.lon, params.lat), params.zoom);
+
+  if ($("#map").hasClass("set_location")) {
+    var marker;
+
+    if (params.marker) {
+      marker = addMarkerToMap(new OpenLayers.LonLat(params.lon, params.lat));
+    }
+
+    map.events.register("click", map, function (e) {
+      closeMapPopup();
+
+      if (document.getElementById('updatehome').checked) {
+        var lonlat = getEventPosition(e);
+
+        document.getElementById('homerow').className = '';
+        document.getElementById('home_lat').value = lonlat.lat;
+        document.getElementById('home_lon').value = lonlat.lon;
+
+        if (marker) {
+          removeMarkerFromMap(marker);
+        }
+
+        marker = addMarkerToMap(lonlat);
+      }
+    });
+  } else {
+    addMarkerToMap(new OpenLayers.LonLat(params.lon, params.lat), null, params.marker.description);
+
+    $("[data-user]").each(function () {
+      var user = $(this).data('user');
+      if (user.lon && user.lat) {
+        var icon = OpenLayers.Marker.defaultIcon();
+        icon.url = OpenLayers.Util.getImageLocation(user.icon);
+        addMarkerToMap(new OpenLayers.LonLat(user.lon, user.lat), icon, user.description);
+      }
+    });
+  }
+}
+
+window.onload = init;