jqGrid find clicked column by name¶

$('#list').jqGrid({
    ondblClickRow: function(rowid, irow, icol) {
        var ret = $(this).jqGrid('getRowData',rowid);
        var cm = $(this).jqGrid('getGridParam','colModel');
        if(cm[icol].name == "selected"){
                //...
        }
        else if(cm[icol].name == "del_image"){
                //...
        }
        //...