jQuery Grid Plugin - jqGrid

Hi

Thanks for this great looking plugin.

Ive only just started using this plugin and apologies if this has been

explained already. Im trying to grab my select box lookups in a seperate

get query and then just add the variable to relavent colModel line. Is

this even possible. I cant get it to work anyway.

$(document).ready(function(){
var chainvar;                          
$.get("inc/asp/ajaxChainLookup.asp", function ( data ){
        chainvar = data;
    })
var artworker = $("#arthidden").val();   
var datequery = $("#hiddendate").val();
var lastcellstate;
$("#navgrid").jqGrid({
       url:'inc/asp/ajaxGridLookup.asp?artworker=' + artworker + '&dateofjob=' + datequery,
    datatype: "xml",
       colNames:['ID', 'Chain', 'JobType', 'Duration'],
       colModel:[
           {name:'ID',index:'ID', width:55,editable:false,editoptions:{readonly:true,size:10}},

Attempted to add the variable in here as chainvar:-

           {name:'chain',index:'chain', width:100,editable:true,edittype:'select',editoptions:{value:chainvar}},
           {name:'jobtype',index:'jobtype', width:200,editable:true,editoptions:{size:25}},
           {name:'duration',index:'duration', width:60,editable:true,editoptions:{size:10}}],
sortname: 'ID',
sortorder: "desc",
onSelectRow: function(id){ if(id && id!==lastcellstate)
{ jQuery('#navgrid').restoreRow(lastcellstate);
jQuery('#navgrid').editRow(id,true); lastcellstate=id; } },
editurl: "ajaxGridUpdate.asp",
viewrecords: true,
imgpath: 'inc/themes/coffee/images',
caption: 'Grid'
});
});

I just get an options.value is undefined error,