query posts from 2 categories

Hi there, im trying to display posts on my homepage from 2 categories.

So far i have ` <?php

// The Query

wp_reset_query();

query_posts(‘showposts=3&cat=229&75’); if (have_posts()) : ?>

<?php while (have_posts()) : the_post();?>

<div>

<div id=”wrapper33″>

<a href=”<?php the_permalink(); ?>”>

<h3><?php echo substr(get_the_title(),0,58); ?></h3>

<?php echo substr(the_category(),1,30); ?>

<?php echo get_excerpt(190); ?>
<?php
$attachment_id = get_post_thumbnail_id(); // attachment ID
$image_attributes = wp_get_attachment_image_src( $attachment_id ); // returns an array
?>

<br><p><img src=”<?php bloginfo(‘url’); ?>/imgresize.php?src=<?php echo $image_attributes[0]; ?>&h=135&w=400″></p> `

As you can see i tried the two category I.Ds 229&75 but this is not working. If i just have the one it works fine.

Any suggestions?

Thank you