how to show a grid of wordpress posts post img as background, title and text ove

im new in wordpress, i try to do a row table of a specific category. this should get out in a div, with the post image as background. the title and the text should overlay the image. could you help me?

[php]`<?php
// code to display a number of posts in multi columns top-to-bottom left-to-right
?>
<?php global $query_string; ?>

<?php
$set_number_of_columns = 100; // enter numbers of columns here;
$set_number_of_rows = 100; // enter numbers of rows here
$set_showpost = $set_number_of_columns * $set_number_of_rows ;

//setup query with parameter for paged
$paged = (get_query_var(‘paged’)) ? get_query_var(‘paged’) : 1;
//query_posts($query_string.’&showposts=’.$set_showpost.’&paged=’.$paged);
// get number of posts for this,
$num_of_posts = $wp_query->post_count;
// make adjustment for paged to get three equaly long columns even on last paged page
// divide by $set_number_of_columns to get number per column,
// round up to next integer to make $ppc posts per column variable, or $set_number_of_rows whatever is smaller
$ppc = min(ceil($num_of_posts/$set_number_of_columns),$set_number_of_rows);
// calculates number of rows, i.e. showposts for the following query_posts and get_posts
?>
<?php for ( $col = 1; $col <= $set_number_of_columns; $col += 1) { ?>
<div class=””>
<?php
$row = 1;
$noffset = ($col -1) * $ppc + ($paged – 1) * $set_showpost ; //calculate offset parameter if paged
$posts = get_posts(‘numberposts=’.$ppc.’&offset=’.$noffset.’&cat=103′);
foreach ($posts as $post) : start_wp(); ?>
<div id=”subImageContainer4″ class=”subImageContainer”>
<!– start of anything to do with post –>
<h1><a href=”<?php the_permalink() ?>” rel=”bookmark”><?php the_title(); ?></a></h1>
<div class=”storycontent2″ >
<?php echo get_the_post_thumbnail( $post_id, $size, $attr ); ?>
<?php the_excerpt(__(‘(more…)’)); ?>
</div>
<!– end of anything to do with post –>
</div> <!– end #post –>
<?php
$row++;
endforeach; ?>
</div>`[php]