a_before = "widget_1;widget_3;widget_2;|widget_5|".split("|").split(";")
    a_after = "widget_1;widget_3;widget_2;||widget_5".split("|").split(";")

      line=""

    #parcourir les tableaux
    a_before.each_with_index do |a_column,index|
      a_column.each do |item|
          a_bpos=position(a_before,item)
          a_apos=position(a_after,item)
          if a_bpos!=a_apos
            line+=" MODIF "
          end
        end
    end