Can't make it works!

Hi there,
Trying to add pagination to my website…
but something is wrong and I can’t make it….
tried different loop, however, no luck!
the loop I’m using is :
` <?php query_posts( array( ‘cat’ => 19, ‘showposts’ => 6, ‘paged’ => get_query_var(‘paged’) ) ); ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

<div class=”xxxx”>
<h4> <?php the_date(‘l, j \d\e F, Y’);?> </h4>
“><h1><?php the_title(); ?></h1>

<p><?php the_excerpt(); ?></p>
</div>
<?php endwhile?>
<?php else: ?>
<?php endif; ?>

<div class=”yyyyyy”>
<?php wp_pagenavi( ); ?>
</div>

Any idea?
thanks!

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