diff --git a/lib/dubious/form_helper.duby b/lib/dubious/form_helper.duby
index 36daaaa..571b079 100644
--- a/lib/dubious/form_helper.duby
+++ b/lib/dubious/form_helper.duby
@@ -1,11 +1,10 @@
 import com.google.appengine.ext.duby.db.Model
-import java.lang.StringBuilder
 import dubious.TimeConversion
 import dubious.InstanceTag
-import java.util.List
 import java.util.HashMap
-import stdlib.Array
+import java.util.List
 import java.util.Date
+import stdlib.*
 
 class FormHelper
   def initialize(model:Model, params:Params)
@@ -38,15 +37,13 @@ class FormHelper
   end
 
   def start_form
-    method = ["get" ,"post"].contains(@method) ? "" : @t.tag("input",
+    _method = ["get" ,"post"].contains(@method) ? "" : @t.tag("input",
         :name => "_method", :type => "hidden", :value => @method)
-    hm1 = {:action => @action, :method => "post"}
-    hm1.put('id', "#{@params.action}_#{@kind}")
-    hm1.put('class', @params.action)
-    hm2 = HashMap.new; hm2.put('style', "margin:0;padding:0;display:inline")
-    hm3 = {:name => "authenticity_token", :type => "hidden"}
-    hm3.put('value', @token)
-    @t.tag("form", hm1, true) + method + @t.tag("div", hm2, true) +
+    hm1 = Ha.sh [:action, @action, :id, "#{@params.action}_#{@kind}",
+                 :method, "post",  :class, @params.action]
+    hm2 = Ha.sh [:style, "margin:0;padding:0;display:inline"]
+    hm3 = Ha.sh [:name, "authenticity_token", :type, "hidden", :value, @token]
+    @t.tag("form", hm1, true) + _method + @t.tag("div", hm2, true) +
     @t.tag("input", hm3) + "</div>"
   end