function addEvent(obj, evType, fn)
{
    if (obj.addEventListener)
    {
        obj.addEventListener(evType, fn, false);
        return true;
    }
    else if (obj.attachEvent)
    {
        var r = obj.attachEvent('on'+evType, fn);
        return r;
    }
    else
    {
        alert('Handler could not be attached');
    }
}