I need to display pager for both top and bottom of the node for user to easily to move between pages. The one in the bottom is normally display but I want it to display in the top section also. To do that, Just put the following code :
<?php echo theme('pager', null, 1, 0, array(), 9); ?>
If you want to change the number of pages in the list, just change number 9 to anything you want.
When put that code in page.tpl.php, it will look like below :