diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index 284aae91..f1ddcfcb 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -245,7 +245,7 @@ module IssuesHelper
     when :in
       if gantt.zoom < 4
         link_to_remote(l(:text_zoom_in) + image_tag('zoom_in.png', img_attributes.merge(:alt => l(:text_zoom_in))),
-                       {:url => gantt.params.merge(:zoom => (gantt.zoom+1)), :update => 'content'},
+                       {:url => gantt.params.merge(:zoom => (gantt.zoom+1)), :method => :get, :update => 'content'},
                        {:href => url_for(gantt.params.merge(:zoom => (gantt.zoom+1)))})
       else
         l(:text_zoom_in) +
@@ -255,7 +255,7 @@ module IssuesHelper
     when :out
       if gantt.zoom > 1
         link_to_remote(l(:text_zoom_out) + image_tag('zoom_out.png', img_attributes.merge(:alt => l(:text_zoom_out))),
-                       {:url => gantt.params.merge(:zoom => (gantt.zoom-1)), :update => 'content'},
+                       {:url => gantt.params.merge(:zoom => (gantt.zoom-1)), :method => :get, :update => 'content'},
                        {:href => url_for(gantt.params.merge(:zoom => (gantt.zoom-1)))})
       else
         l(:text_zoom_out) +
diff --git a/app/views/gantts/show.html.erb b/app/views/gantts/show.html.erb
index ce8c67b2..5a64054a 100644
--- a/app/views/gantts/show.html.erb
+++ b/app/views/gantts/show.html.erb
@@ -169,8 +169,8 @@ if Date.today >= @gantt.date_from and Date.today <= @gantt.date_to %>
 
 <table width="100%">
 <tr>
-<td align="left"><%= link_to_remote ('&#171; ' + l(:label_previous)), {:url => @gantt.params_previous, :update => 'content', :complete => 'window.scrollTo(0,0)'}, {:href => url_for(@gantt.params_previous)} %></td>
-<td align="right"><%= link_to_remote (l(:label_next) + ' &#187;'), {:url => @gantt.params_next, :update => 'content', :complete => 'window.scrollTo(0,0)'}, {:href => url_for(@gantt.params_next)} %></td>
+<td align="left"><%= link_to_remote ('&#171; ' + l(:label_previous)), {:url => @gantt.params_previous, :method => :get, :update => 'content', :complete => 'window.scrollTo(0,0)'}, {:href => url_for(@gantt.params_previous)} %></td>
+<td align="right"><%= link_to_remote (l(:label_next) + ' &#187;'), {:url => @gantt.params_next, :method => :get, :update => 'content', :complete => 'window.scrollTo(0,0)'}, {:href => url_for(@gantt.params_next)} %></td>
 </tr>
 </table>
 
diff --git a/lib/redmine/helpers/gantt.rb b/lib/redmine/helpers/gantt.rb
index 7c694022..cec32372 100644
--- a/lib/redmine/helpers/gantt.rb
+++ b/lib/redmine/helpers/gantt.rb
@@ -68,17 +68,21 @@ module Redmine
         @date_from = Date.civil(@year_from, @month_from, 1)
         @date_to = (@date_from >> @months) - 1
       end
+
+      def common_params
+        { :controller => 'gantts', :action => 'show', :project_id => @project }
+      end
       
       def params
-        { :zoom => zoom, :year => year_from, :month => month_from, :months => months }
+        common_params.merge({  :zoom => zoom, :year => year_from, :month => month_from, :months => months })
       end
       
       def params_previous
-        { :year => (date_from << months).year, :month => (date_from << months).month, :zoom => zoom, :months => months }
+        common_params.merge({:year => (date_from << months).year, :month => (date_from << months).month, :zoom => zoom, :months => months })
       end
       
       def params_next
-        { :year => (date_from >> months).year, :month => (date_from >> months).month, :zoom => zoom, :months => months }
+        common_params.merge({:year => (date_from >> months).year, :month => (date_from >> months).month, :zoom => zoom, :months => months })
       end
 
             ### Extracted from the HTML view/helpers