Trouble populating drop-down from DB

Hello,

What I Have: I have a form that a user enters information in. That
information is stored in a DB.

What I Want: I want to allow the user to edit/update that information
-you know CRUD

My Problem: Everything is good until I try to populate the select list
in the edit form. I do not know how to populate the list with the
pre-defined options while having the user's previous selection
selected.

Code example or links to tutorial would be useful.

Thanks in advance -- K

----The Code----

Model:

class Page < ActiveRecord::Base
  belongs_to :user

  TEMPLATE_STYLES = [

     ["History", "history"] ,
     ["Humanities", "human"],
     ["Life Sciences", "life"],
     ["Engineering", "eng"],
     ["Social Sciences", "social"]
   ]

validates_presence_of :file, :title, :template
#...

Controller:
class AdminController < ApplicationController

def create_page
    @page = Page.new(params[:page])
    @page.user = User.find_by_id(session[:user_id])
    if request.post? and @page.save
      flash.now[:notice] = "Page #{@page.title} was created"
      @page = Page.new
      redirect_to( :action => 'index')
    end
  end

def edit
    @page = Page.find(params[:id])
  end

  def update
    @page = Page.find(params[:id])
    if @page.update_attributes(params[:page])
      flash[:notice] = 'Page was successfully updated.'
      redirect_to :action => 'list_pages'
    else
      render :action => 'edit'
    end
  end

View:
<%= start_form_tag :action => 'update', :id => @page %>

            <p>
                <label for="page_title" >Page Title:</label>
                <%= text_field 'page', 'title' %></p>
            </p>

            <p>
                <label for="file_name" >File Name:</label>
              <%= text_field 'page', 'file' %></p>
            </p>
            <p>
                <label for="template" >Template:</label>
                <%=
                    form.select :template,
                    Page::TEMPLATE_STYLES,
                    ???
                %>

            </p>
            <%= submit_tag "Edit Page" , :class => "submit" %>
       <%= end_form_tag %>

Thanks.