changed to will_paginate

Hi
    Till now we used the rails pagination.But now onwards shifting to
will_paginate
The code I use currently is as below .This is with the help of
find_where pluggin..A fantastic pluggin which we still want to use...I
would like to know how can i modify the following code to work with
will_paginate

step 1: set the variables you'll need
            page = (params[:page] ||= 1).to_i
            items_per_page = 20
            offset = (page - 1) * items_per_page
           # step 2: instead of performing the full find, just find the
record count

            @search_sd_ticket_count_result =
ServiceDeskTicket.find_where(:all,:select=>'count(*) as count1' ) do

sd>

                                     sd.number.downcase =~
"%"+@sd_ticket_number.downcase+"%" if !@sd_ticket_number.nil?
                                     sd.service_desk_status_id==
@sd_ticket_status_id
                                     sd.service_desk_priority_id==
@sd_ticket_priority_id
                                     sd.primary_assignee==
@sd_ticket_primary_assignee
                                     sd.created_on <=>
(@sd_ticket_start_date..@sd_ticket_end_date) if
!@sd_ticket_start_date==nil and !@sd_ticket_end_date==nil
                                 end

            record_count=@search_sd_ticket_count_result[0].count1.to_i

            # step 3: create a Paginator, the second variable has to be
the number of ALL items on all pages
            @search_sd_ticket_result_pages = Paginator.new(self,
record_count, items_per_page, page)

            # step 4: only find the requested subset of
@search_sd_ticket_result
# @search_sd_ticket_result =
ServiceDeskTicket.find_where(:all,:offset=>offset,:limit=>items_per_page
) do |sd|
                                     sd.number.downcase =~
"%"+@sd_ticket_number.downcase+"%" if !@sd_ticket_number.nil?
                                     sd.service_desk_status_id==
@sd_ticket_status_id
                                     sd.service_desk_priority_id==
@sd_ticket_priority_id
                                     sd.primary_assignee==
@sd_ticket_primary_assignee
                                     sd.created_on <=>
(@sd_ticket_start_date..@sd_ticket_end_date) if
!@sd_ticket_start_date==nil and !@sd_ticket_end_date==nil

                                 end

I could do will_paginate with imple cases like
@sd_attachments=@sd_ticket.sd_attchments.paginate
:per_page=>20,:page=>params[:page] and in view <%= will_paginate %>
.But how can I convert the above to use will_paginate
Thanks in advance
Sijo