Previous / Next post links

On my site, I’ve setup a couple of previous/next buttons using:

<div id="footer_nav">
    <div class="pevious_post"><?php previous_post_link('%link', '<span class="ui-icon ui-icon-circle-triangle-w"></span> Previous', TRUE); ?></div>
    <div class="next_post"><?php next_post_link('%link', '<span class="ui-icon ui-icon-circle-triangle-e"></span> Next', TRUE); ?></div>
    </div>

And this works, but they only cycle through that category, which means on the front page you might see articles 1-20, but when using the navigation you go 1,2,12,15,20 not 1,2,3,4,5 etc.

So I guess what I;m asking is can the previous_post_link & next_post_link be configured to look at the whole site, not just the current category.