Dom library is not working as intended

Questions
1

I’m trying to run following statement:-

$$('#L'+id).attr('src',likebutton);
$$('#LikeCount'+id).html(status);

Above statements did not run or nothing happens.
Here, element with id 'L'+id exists before the event is fired up and this element is added dynamically(which i believe is the main reason for this abnormal behaviour

2

Define,
Var $$ = Dom7;
This may work
Good luck!!!

3

I already tried this

4

Try defining the selector outside of the brackets.

var itemToId = "#L" + id;
$$(itemToId).attr('src', likebutton);