jQuery Grid Plugin - jqGrid

I am currently trying to use the custom edittype and editoptions.  When I call my grid the column with those types comes back blank.  I am currently trying to have multiple checkboxes in a cell.

{name:'approval', sortable:false, search:false, resizable:false, editable:true, edittype:'custom', editoptions:{custom_element:myelem, custom_value:myvalue}, align:'center', width: 9 }

function myelem(value,options)

{

var el = document.createElement('input');

el.type = 'checkbox';

el.value=value;

return el;

}

function myvalue(elem,operation,value)

{

if(operation === 'get')

{

return $(elem).find("input").val();

}

else

{

$("input",elem).val(value);

}

}