Problem with clone and append

Problem with clone and append

Hello all,
I am facing a problem using clone method, i'm trying to clone a table row (that contains drop down lists ) and then append it to the same table. but when appending the new row all the drop downs values are reset

The code:
  1. var rowId; // Equals the id of the row to be clone
  2. var tableId; // Equals the id of the table
  3. var newRow = jQuery('[id$='+rowId+']').clone(true);
  4. jQuery('[id$='+tableId+']').append(newRow);

Anybody could help me ?