diff --git a/app/views/impasse_test_case/index.html.erb b/app/views/impasse_test_case/index.html.erb
index f739a4f..ce6727f 100644
--- a/app/views/impasse_test_case/index.html.erb
+++ b/app/views/impasse_test_case/index.html.erb
@@ -142,7 +142,7 @@
     <% versions.each do |version| %>
   <h4><%=h version.name%> - <%= link_to l(:label_test_plan_coverage), :controller=>:impasse_test_plans, :action=>:coverage, :project_id=>@project, :id=>version.id%></h4>
   <table style="border-collapse: collapse; width: 100%;">
-    <tr><td class="td_tr_plans"></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/book-brown.png" alt="Total" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/tick.png" alt="OK" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/cross.png" alt="Failed" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/wall-brick.png" alt="In process" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/document-attribute-t.png" alt="No run" /></td></tr>
+    <tr><td class="td_tr_plans"></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/book-brown.png" alt="Total" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/tick.png" alt="OK" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/cross.png" alt="Failed" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/wall-brick.png" alt="In process" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/document-attribute-t.png" alt="No run" /></td></tr>
       <% plans[version].each do |test_plan| %>
     <tr>
   <% total, ok, fail, proc, undone = Impasse::TestPlan.get_statistics_for_plan(version.name,test_plan.name, version.project_id)  %>
diff --git a/app/views/impasse_test_plans/coverage.html.erb b/app/views/impasse_test_plans/coverage.html.erb
index df92f47..67d7377 100644
--- a/app/views/impasse_test_plans/coverage.html.erb
+++ b/app/views/impasse_test_plans/coverage.html.erb
@@ -13,7 +13,7 @@ function goBack()
 <h2><%= Impasse::TestPlan.find_version_name(@version) %> - <%=l(:label_test_plan_coverage_cases)%> </h2>
 <p><%= link_to "<< "+ l(:label_test_plan_coverage_back), :controller=>:impasse_test_case, :project_id=>@project%></p>
 <table style="border-collapse: collapse; width: 100%;">
-  <tr><td class="td_tr_plans"></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/book-brown.png" alt="Total" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/tick.png" alt="OK" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/cross.png" alt="Failed" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/wall-brick.png" alt="In process" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/document-attribute-t.png" alt="No run" /></td></tr>
+  <tr><td class="td_tr_plans"></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/book-brown.png" alt="Total" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/tick.png" alt="OK" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/cross.png" alt="Failed" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/wall-brick.png" alt="In process" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/document-attribute-t.png" alt="No run" /></td></tr>
   <% cases = Impasse::TestPlan.find_test_cases(@version) %>
   <% cases.each do |case_row| %>
     <% case_name = Impasse::TestPlan.find_test_case_name(case_row.id) %>
diff --git a/app/views/impasse_test_plans/coverage_case.html.erb b/app/views/impasse_test_plans/coverage_case.html.erb
index 605b84c..a624f77 100644
--- a/app/views/impasse_test_plans/coverage_case.html.erb
+++ b/app/views/impasse_test_plans/coverage_case.html.erb
@@ -13,7 +13,7 @@ function goBack()
 <h2><%=l(:label_test_plan_coverage_cases)%> '<%= Impasse::TestPlan.find_test_case_name(@case) %>'</h2>
 <p><a href="javascript:goBack();" style="cursor: hand">&lt;&lt; <%=l(:label_test_plan_coverage_back)%></a></p>
 <table style="border-collapse: collapse; width: 100%;">
-  <tr><td class="td_tr_plans"></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/book-brown.png" alt="Total" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/tick.png" alt="OK" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/cross.png" alt="Failed" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/wall-brick.png" alt="In process" /></td><td class="td_tr_plans"><img src="/plugin_assets/redmine_impasse/stylesheets/images/document-attribute-t.png" alt="No run" /></td></tr>
+  <tr><td class="td_tr_plans"></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/book-brown.png" alt="Total" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/tick.png" alt="OK" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/cross.png" alt="Failed" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/wall-brick.png" alt="In process" /></td><td class="td_tr_plans"><img src="<%=Redmine::Utils::relative_url_root%>/plugin_assets/redmine_impasse/stylesheets/images/document-attribute-t.png" alt="No run" /></td></tr>
   <% plans = Impasse::TestPlan.find_testers(@case) %>
   <% plans.each do |plan| %>
     <tr>