CRM 4.0 Filtering Lookup For Records Lookups

Hi

Got a question regarding filtered lookups in CRM.. What I'm trying to achieve is when a user opens a Campaign Response record, they click on the lookup for the relating Campaign record. In the list of campaigns that come back, I want to show all except those ones that have been Cancelled.

Now there are loads of blogs, web sites, etc.. giving solution to this problem. One I picked on was at;

http://crm.georged.id.au/post/2008/02/16/Filtering-lookup-data-in-CRM-4.aspx

Now, I followed that example and did all steaps outlines.. I created my version of the piece of code below and placed it in the onLoad() event of the Campaign Response.

Doesn't work... Am I missing something completely here ?

var field= crmForm.all.regardingobjectid;
    field.lookupbrowse = 1; 
    
    // Pass fetch xml through search value parameter 
    field.AddParam("search", 
      "fetchXml=<fetch mapping='logical'><entity name='campaign'>"
       + "<all-attributes/><filter type='and'><condition attribute='statuscode'"
       +" operator='ne' value='4' /></filter></entity></fetch>");

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