jQuery Grid Plugin - jqGrid

Hi,

My Master/Detail Grid works nicely with the exception of adding a row to the Detail grid. Any attempt to post he Rowid from the Master Grid to the Detail results in a NULL value.

I set the editurl in the Detail Grid to:

editurl:"tax.cfm?met=editzip&countyid="+jQuery('#ctylist').jqGrid('getGridParam','selrow'), 

I know that jQuery('#ctylist').jqGrid('getGridParam','selrow') returns the correct Value, but in Firebug the URL shows as:

tax.cfm?met=editzip&countyid=null.

Can anybody point me to a working Demo?

Thanks for any help