jQuery Grid Plugin - jqGrid

I just copied some sample code to create a jqGrid and fill with hard-coded array data, but the grid displays with checkboxes in the first column of the grid. What statement below is telling it to do that??

jQuery(

"#BmpList").jqGrid({

datatype:

"local",

height: 250,

colNames: [

'Inv No', 'Date', 'Client', 'Amount', 'Tax', 'Total', 'Notes'],

colModel: [

{ name:

'id', index: 'id', width: 60, sorttype: "int" },

{ name:

'invdate', index: 'invdate', width: 90, sorttype: "date" },

{ name:

'name', index: 'name', width: 100 },

{ name:

'amount', index: 'amount', width: 80, align: "right", sorttype: "float" },

{ name:

'tax', index: 'tax', width: 80, align: "right", sorttype: "float" },

{ name:

'total', index: 'total', width: 80, align: "right", sorttype: "float" },

{ name:

'note', index: 'note', width: 150, sortable: false }

],

multiselect:

true,

caption:

"Manipulating Array Data"

});

var mydata = [

{ id:

"1", invdate: "2007-10-01", name: "test", note: "note", amount: "200.00", tax: "10.00", total: "210.00" },

{ id:

"2", invdate: "2007-10-02", name: "test2", note: "note2", amount: "300.00", tax: "20.00", total: "320.00" },

{ id:

"3", invdate: "2007-09-01", name: "test3", note: "note3", amount: "400.00", tax: "30.00", total: "430.00" },

{ id:

"4", invdate: "2007-10-04", name: "test", note: "note", amount: "200.00", tax: "10.00", total: "210.00" },

{ id:

"5", invdate: "2007-10-05", name: "test2", note: "note2", amount: "300.00", tax: "20.00", total: "320.00" },

{ id:

"6", invdate: "2007-09-06", name: "test3", note: "note3", amount: "400.00", tax: "30.00", total: "430.00" },

{ id:

"7", invdate: "2007-10-04", name: "test", note: "note", amount: "200.00", tax: "10.00", total: "210.00" },

{ id:

"8", invdate: "2007-10-03", name: "test2", note: "note2", amount: "300.00", tax: "20.00", total: "320.00" },

{ id:

"9", invdate: "2007-09-01", name: "test3", note: "note3", amount: "400.00", tax: "30.00", total: "430.00" }

];

for (var i = 0; i <= mydata.length; i++)

jQuery(

"#BmpList").jqGrid('addRowData', i + 1, mydata[i]);