Building search filters by passing parameters

Hiya,

I'm trying to build a search filter by cliking on headers of my table. So the order by clause of the query is built on the fly. I can't get the string to have more that 1 item. Can anyone help?

Thanks

Links:

  <thead>
  <td ><a href="?area=joblog/index&sort=jobname" >Title</a></td>
    <td ><a href="?area=joblog/index&sort=jobdeadline" >Deadline</a></td>
    <td ><a href="?area=joblog/index&sort=jobpriority" >Priority</a></td>
    <td><a href="?area=joblog/index&sort=jobfor" >Customer</a></td>
    </thead>

code:

<cfparam name="filter" default="">
<cfif isdefined("sort")>
  <cfif listlen("filter") eq 1 >
    <cfset filter =  filter & ", " &  sort>
    <cfelse>
    <cfset filter =  sort>
  </cfif>
  <cfelse>
  <cfset filter = "jobname">
</cfif>

<cfquery name="get" datasource="joblog">
SELECT     *
FROM job
                     
                      INNER JOIN
                      priority ON job.jobpriority = priority.priorityid
                               
                      WHERE job.jobcomplete = 'false'
                     
                      ORDER BY 
              
                      #filter#
                     
        
</cfquery>