Offset Recent Article on Homepage

I want to offset the recent articles that display on the homepage on a per category basis.

This code below offset all posts from all categories by any number you choose.

<?php
global $myOffset;
$myOffset = 10;
$temp = $wp_query;
$wp_query= null;
$wp_query = new WP_Query();
$wp_query->query(‘offset=’.$myOffset.’&showposts=5′.’& paged=’.$paged);
?>

How can I offset the recent posts on a per category basis rather than offset everything?

Thanks