[Plugin: WP-PageNavi] only text showing for next pages but no link or what so ever is acting.

Hi,

I just installed this plugin in my imbalance theme at http://www.books.alkamunia.com, alghough it showing total numbers of pages but no link is active under these page numbers, only plane text is showing.

Any advice?

http://wordpress.org/extend/plugins/wp-pagenavi/