Topic: Need Help with my Application to use JQuery Rails

Hi I have a problem with my Rails Application currently I am trying to do ajax processing using Rails.
My Model (Question) needs to do a few things
It needs to show a question to the user then when the user click submit it will update the question and show the next question.
It works fine when I was using Rails only but it doesn't work when I tried to include Ajax JQuery.
I am facing 2 Problem
1)The first time when the form is submitted it does not load the next question, only subsequent click loads it
2)I need to redirect the user to another page when all questions are completed which I don't know where to insert the code in.
questions_controller.rb

class QuestionsController < ApplicationController
layout "application"
before_filter :authenticate_student!
  def index
  current_student.starttime
    if current_student.challenge.completed?
  redirect_to student_result_path
    elsif current_student.challenge_start==false
  redirect_to student_home_path
    else
  @question_no = current_student.challenge.last_attempted_question
  @question = current_student.questions.find_by_question_idx(@question_no)
      @displayquestion=current_student.get_displayquestion(@question.question_no)
  @timeleft=current_student.challenge.time_limit-Time.now
  
      respond_to do |format|
        format.js 
        format.html # index.html.erb
        format.json { render :json => @question }
      end
    end
  end

  # PUT /questions/1
  # PUT /questions/1.json
  def update
    @question = current_student.questions.find_by_question_idx(current_student.challenge.last_attempted_question)  
    @displayquestion=current_student.get_displayquestion(@question.question_no)
    @challenge=current_student.challenge
      @timeleft=current_student.challenge.time_limit-Time.now
  #Check if the answer contains comma by testing against regular expression
  #Execute capture array and concaternate only if answer contains a comma
  if @displayquestion.answer.include?(",")
    if params[:answer].blank?
      @question.answer=""
    else    
      @question.answer=params[:answer].join(",")
    end
  end

    respond_to do |format|
      if @question.update_attributes(params[:question])
  #Marking Routine
    current_student.mark_routine
  #Update Last Attempted Question only when not exceed
    if !@challenge.completed?
    @challenge.increment!(:last_attempted_question)
    #if complete all questions set complete boolean flag to true or times up
      @challenge.check_if_end
    end
  format.js   
        format.html { redirect_to @question, :notice => 'Question was successfully saved.' }
        format.json { head :ok }
      else
  format.js { render :text => "Error Saving Question"}
        format.html { render :action => "edit" }
        format.json { render :json => @question.errors, :status => :unprocessable_entity }
      end
    end
  end
end

update.js.erb

$('#container').html("<%= escape_javascript(render(:partial => 'questiondisplay', :locals => {:question => @question,:timeleft=>@timeleft})) %>");

_questiondisplay.html.erb

<%= content_tag :div, :id=> "timeleft", :data=> {:timeleft=> @timeleft} do -%><% end %>
<fieldset><legend><b><%=t("Question")%>: <%= @question.question_idx %></b></legend>
  <div id="content">
    <div class="grid_5 left">
      <div class="panel01">
        <%= form_for(@question,:remote=>true,:html=>{:name=>"question"}) do |f|%>
        <p><div class ="row">
        <%= label_tag(:topic,@displayquestion.question_text,:class=>"form-label")%>
        </div></p>
        <% if (@displayquestion.answer.include?(",")) %>
        <p>
        <%= check_box_tag 'answer[]',"1"%>
        <%= label_tag(:choice1,@displayquestion.choice1,:class=>"form-label")%>
        </p>
        <p>
        <%= check_box_tag 'answer[]',"2"%>
        <%= label_tag(:choice2,@displayquestion.choice2,:class=>"form-label")%>
        </p>
        <p>
        <%= check_box_tag 'answer[]',"3"%>
        <%= label_tag(:choice3,@displayquestion.choice3,:class=>"form-label")%>
        </p>
        <p>
        <%= check_box_tag 'answer[]',"4"%>
        <%= label_tag(:choice4,@displayquestion.choice4,:class=>"form-label")%>
        </p>
        <% else %>
        <p>
        <%= f.radio_button(:answer, "1") %>
        <%= label_tag(:choice1,@displayquestion.choice1,:class=>"form-label")%>
        </p>
        <p>
        <%= f.radio_button(:answer, "2") %>
        <%= label_tag(:choice2,@displayquestion.choice2,:class=>"form-label")%>
        </p>
        <% if !(@displayquestion.choice3.blank?) %>
        <p>
        <%= f.radio_button(:answer, "3") %>
        <%= label_tag(:choice3,@displayquestion.choice3,:class=>"form-label")%>
        </p>
        <% end %>
        <% if !(@displayquestion.choice4.blank?) %>
        <p>
        <%= f.radio_button(:answer, "4") %>
        <%= label_tag(:choice4,@displayquestion.choice4,:class=>"form-label")%>
        </p>
        <% end %>
        <% end %>
        <% if @question_no==current_student.challenge.last_question %>
        <%= f.submit(:value=>t('finish'),:class =>"large blue awesome",:disable_with=>t('loading')) %>
        <% else %>
        <%= f.submit(:value=>t('next'),:class =>"large blue awesome",:disable_with=>t('loading')) %>
        <% end %>
        <% end %>
      </div><!-- /.panel01 -->    
    </div><!-- /.grid-5 -->

    <div class="grid_5 right">
      <div class="panel02">
        <span class="clock">
        <span class="timer"><%=t("timer")%></span>
        <span id="clock">&nbsp;</span>
        </span>
      </div>
    </div>
  </div></fieldset>

index.html.erb

<div id="container">
        <%= render :partial=> 'questiondisplay' %>
</div>