losing pagination

Hi,

i wanted to show an specific category on the homepage and another category in another place in the site. so i came to this code before the loop in the index page :

<?php
if (is_category(‘5’))
{
query_posts(‘cat=5&showposts=’.get_option(‘posts_per_page’));
}else{
query_posts(‘cat=1&showposts=’.get_option(‘posts_per_page’));
}
?>

It seems to word but when i try to select the second page it always loads the first page.

Any help?

Thanks in advance.