What Is My Fault With This WP_QUERY ? [ Pagination Problem ]

I did! My new codes:

<?php /** * Displays the Pagination in Custom loop * */?>
<?php get_header(); ?>
<?php global $wp_query;
$aranan= $_GET['s']; 
$kategorim = intval($_GET['cat']);
$kateg1= $_GET['kategorisec'];
if (intval($kateg1)<0) { $kateg = ""; } else { $kateg = $kateg1; }
$myterm = get_term( $kategorim, 'fgaleri' ); 
global $myslug;
$myslug = $myterm->slug; ?>
<div id="content">
<?php $rakam= 0;
//The query
$wp_query->query( array( 'post_type' =>'fotograf', 's' => $aranan, 'paged' => $paged, 'taxonomy' => 'fgaleri', 'fgaleri' => $kateg ) );
//The loop
?><div id="FGaleri_2"><div id="FGaleri_Ic"><div id="FGaleriBaslik">Fotoğraf Galerisi     <form action="<?php echo get_bloginfo('wpurl'); ?>" id="searchformfoto" method="get" name="searchform">
<?php $args = array( 'walker'=> new SH_Walker_TaxonomyDropdown(), 'class' => 'postform', 'id' => 'kategorisec', 'name' => 'kategorisec', 'value'=>'slug', 'taxonomy' => 'fgaleri', 'show_option_none' => 'Kategori Seç ve Ara', 'hierarchical' => 1 ); wp_dropdown_categories($args); ?>
<div id="aramabolumufoto">
<input name="s" id="sfoto" type="text" value=""/>
<input type="hidden" name="post_type" value="fotograf" />
<input id="searchsubmitfoto" type="submit" value="Ara"/>
</div></form></div>
<div class="FGaleri_Ic_2">
<?php while ($wp_query->have_posts()): $wp_query->the_post(); $rakam++; ?>
<div class="FGaleriItem2" style="<?php if ($rakam % 5 == 0 ) { ?>margin-right: 2px;<?php } ?>">
<?php 
$termargs=array('orderby' => 'count', 'order' => 'desc');
$terms = wp_get_post_terms( $post->ID , 'fgaleri', $termargs );
$t = count($terms);
if ($t>0) { ?>
<div class="fkategori">
<?php $c = 0;
foreach($terms as $term) {  
$c++;  
if ($c==$t)   
{   echo '<a class="foto_kategori" href="'. home_url() . '/?kategorisec=" . $term->slug . "&post_type=fotograf" title="' . $term->name . '" ' . '>' . $term->name.'</a> ';  }} ?>
</div><?php } ?>
<div class="ResimUst">
<?php if (has_post_thumbnail()) { ?>
<a href="<?php the_permalink() ?>">
<?php $url = wp_get_attachment_url( get_post_thumbnail_id($post->ID) );$url2 = get_bloginfo('template_directory') . "/timthumb.php?src=" . $url . "&amp;w=100&amp;h=100&amp;zc=1"; ?>
<img src="<?php if(get_option('of_timthumb')=="true") { echo $url2; } else { echo $url; } ?>" alt="" title="" width="100" height="100" /></a>
<?php } ?>
</div><div class="ResimAlt"><a href="<?php the_permalink() ?>">
<?php the_title(); ?>
</a></div></div>
<?php if (($rakam % 5 == 0 ) && ($rakam > 4)) { ?><div class="clearboth"></div><?php } ?>
<?php endwhile; ?></div></div></div><div class="clearboth"></div>
<?php if(function_exists('wp_pagenavi') ) {     
wp_pagenavi(); 
//function call for plugin pagination( wp pagenavi plugin)
} else { ?>     
<div id="navigasyon"><span class="previous-entries">
<?php next_posts_link('« Daha Eski Fotoğraflar'); ?></span>
<span class="next-entries"><?php previous_posts_link('Daha Yeni Fotoğraflar »'); ?></span>
</div><?php } //endif ?><?php ?></div><?php get_sidebar(); ?></div><?php get_footer(); ?>