Array params in form_tag

Hello i have a lot of time trying to figure this out. I am having problem sending array params with form_tag :remote=>true

form.erb   <%#= form_tag reporte_client_reports_path do%>   <%= form_tag reporte_client_reports_path,:remote=>true do%>    <p>      <%= label_tag :cuts %>      <%= select_tag "cuts", options_from_collection_for_select(@cuts, "real_cut", "cut"), :multiple=>true, :id => "cuts"%>   </p>

<p>    <%= submit_tag 'Send' %> </p> <%end%>

Controller def report       @cuts = params[:cuts]

respond_to do |format|         format.html {render :layout => false if request.xhr?}         format.js #{render :layout => false}   end end

Results

debug results: - 2011-02-15,2011-02-28,2011-03-15,2011-03-31

It work if i use   <%= form_tag reporte_client_reports_path do%>

debug results:

I resolved in functional way, but there might be something very weird with this in my controller:

if request.xhr?         @super = params[:supermercados].to_s.split(",")         @cortess = params[:cortes].to_s.split(",")         @prods = params[:productos].to_s.split(",") end