+<% if params['lon'] and params['lat'] %>
+<% lon = h(params['lon']) %>
+<% lat = h(params['lat']) %>
+<% zoom = h(params['zoom'] || '5') %>
+<% layers = h(params['layers']) %>
+<% elsif params['mlon'] and params['mlat'] %>
+<% lon = h(params['mlon']) %>
+<% lat = h(params['mlat']) %>
+<% zoom = h(params['zoom'] || '12') %>
+<% layers = h(params['layers']) %>
+<% elsif cookies.key?("location") %>
+<% lon,lat,zoom,layers = cookies["location"].split(",") %>
+<% elsif @user and !@user.home_lon.nil? and !@user.home_lat.nil? %>
+<% lon = @user.home_lon %>
+<% lat = @user.home_lat %>
+<% zoom = '10' %>
+<% else %>
+<% session[:location] = OSM::IPLocation(request.env['REMOTE_ADDR']) unless session[:location] %>
+<% if session[:location] %>
+<% bbox = true %>
+<% minlon = session[:location][:minlon] %>
+<% minlat = session[:location][:minlat] %>
+<% maxlon = session[:location][:maxlon] %>
+<% maxlat = session[:location][:maxlat] %>
+<% else %>
+<% lon = '-0.1' %>
+<% lat = '51.5' %>
+<% zoom = h(params['zoom'] || '5') %>
+<% layers = h(params['layers']) %>
+<% end %>
+<% end %>