options selected

jeg kan ikke få den escapede linje til at virke.. når jeg undescaper bliver min select slet ikke lavet

select_obj.options[select_obj.options.length] = new Option(option_obj[key], key);
//select_obj.options[select_obj.options.length].selected = (value == option_obj[key]) ? true:false;

hele koden:

function append_select(obj, int, option_obj)
{
    var value = obj[int].getElementsByTagName('span')[0].innerHTML;
   
    var select_obj = document.createElement('select');
   
    for(var key in option_obj)
    {
        select_obj.options[select_obj.options.length] = new Option(option_obj[key], key);
        select_obj.options[select_obj.options.length].selected = (value == option_obj[key]) ? true:false;
    }
   
    obj[int].removeChild(obj[int].getElementsByTagName('span')[0]);
    obj[int].appendChild(select_obj);
}