addding class to current item from the loop

Hey guys Ive created a slider using post_meta thanks to tutorial and working on it to make it as i wish,i got the while loop code belove. Im trying to add class to current item of the loop. I used if statement to achieve this, however it adds the current to every item. Not only to the one what is being displayed. So I cud do anything to the displayed item, witohut changing others. Can anyone help me ?? ?

<?php
                // The Loop
                $IDOutsideLoop = $post->ID;
                while ( $the_query->have_posts() ) : $the_query->the_post();
 ?>
                    <li id="test">

<?php   // The Slide's Image
                    if(has_post_thumbnail()) {
$image_src = wp_get_attachment_image_src( get_post_thumbnail_id(),'full' );
 echo '<img src="' . $image_src[0]  . '" width="100%"  />';
}
                    ?>

<div id="slider_tlo">
<?php
                         if ( get_post_meta( get_the_id(), 'wptuts_slideurl_tekst', true) != '' ) {?>
                         <span class="test3<?php
 if($IDOutsideLoop == $post->ID) 

    {
      echo "current";
       }
      ?>" id="caption"><?php echo ( get_post_meta( get_the_id(),'wptuts_slideurl_tekst', true) ); ?></span>  <?php } ?>
                         <?php
                         if ( get_post_meta( get_the_id(), 'wptuts_slideurl_opis', true) != '' ) {?>
                        ?>">
 </div>
   </li>
                <?php endwhile; ?>