Controller

  def create_asset
    @asset = Asset.new(:name                  => params[:name],
                       :description           => params[:description],
                       :serial_number         => params[:serial_number],
                       :asset_manufacturer_id => params[:asset_manufacturer_id],
                       :asset_model_id        => params[:asset_model_id],
                       :image_filename        => params[:image_filename])

    respond_to do |format|
      format.js
    end
  end

create_asset.js.erb

<% if @asset.errors.any? %>
    var errors = $('<ul />');
    errors.append('<li><%= escape_javascript( error ) %></li>');
    jQuery('#create_asset_message').html(errors);
<% else %>
    jQuery("form#create_asset_form").before('<div id="flash_notice"><%= escape_javascript(flash.delete(:notice)) %></div>');
    jQuery('form#create_asset_form')[0].reset();
<% end %>

jQuery snippet

jQuery(document).ready(function () {
    jQuery('#create_asset_from_template_form').hide();

    jQuery('#create_asset_from_template').bind('click', function() {
        jQuery('#create_asset_from_template_form').toggle();
    });
    jQuery('#asset_create_link').bind('click', function(){
        if (jQuery("#name").val().length < 1){
            jQuery('#create_asset_message').text("Asset Name cannot be blank");
            return false;
        }
        jQuery.ajax({
            url: "/assets/create_asset",
            type: "GET",
            data: {"name"          : jQuery('#name').val(),
                   "description"   : jQuery('#description').val(),
                   "serial_number" : jQuery('#serial_number').val(),
                   "asset_manufacturer_id" : jQuery('#manufacturer_select').val(),
                   "asset_model_id"        : jQuery('#models_select').val(),
                   "image_name"    : jQuery('#image_name').val()},
            dataType: "html"//,
//            success: function(data){
//                jQuery("#create_asset_message").text("Asset Created");
//            },
//            error: function(data) {
//                jQuery("#create_asset_message").text(data.responseText);
//            }
        });
        return false;
    });

    jQuery('form#create_asset_form').submit( function () {
        alert("Meow")
        jQuery.ajax({
            url: "/assets/create_asset.js",
            type: "GET",
            data: {"name"          : jQuery('#name').val(),
                "description"   : jQuery('#description').val(),
                "serial_number" : jQuery('#serial_number').val(),
                "asset_manufacturer_id" : jQuery('#manufacturer_select').val(),
                "asset_model_id"        : jQuery('#models_select').val(),
                "image_name"    : jQuery('#image_name').val()},
            dataType: "html"
        });
        return false;
    });
});

Partial with form

<%= form_tag create_asset_assets_path, :method => :get, :id => "create_asset_form", :remote => true do %>
    <div class="row-fluid">
        <h3>Choose your template: </h3>
        <%= collection_select(:asset, :id, @asset_templates,:id,:name, {:prompt => "Select your template..."}, {:class=>'chzn-select', :onchange => "update_asset_form_div(this.value)"}) %>
    </div>
    <br/>
    <%= render :partial => "create_asset_form", :object => @asset_template, :manufacturers => @manufacturers %>

    <%= submit_tag "Create Asset", :disable_with => "Please wait..." %>

    <div id="create_asset_message"></div>
<% end %>