<%= start_form_tag :controller => 'site', :action => 'search' %>
<%= text_field 'query', 'query'%>
<%= submit_tag 'Search' %>
<%= end_form_tag %>
<% lon = params['lon'] || '-0.1' %>
<% lat = params['lat'] || '51.5' %>
<% zoom = params['zoom'] || '4' %>