Excluding a category from next and previous post links

I am trying to figure out the code to exclude a category from my next and previous post links.

My code for the next and previous is as follows:

<div class="next_prev_cont">
                    <div class="left">
                         <?php previous_post_link('%link', '<i>Previous post</i><br />%title'); ?> 
                    </div>
                    <div class="right">
                         <?php next_post_link('%link', '<i>Next post</i><br />%title'); ?> 
                    </div>
                    <div class="clear"></div>
                </div><!--//next_prev_cont-->

I believe I need to use the following: $excluded_terms = '4835'

4835 being the cat ID, but I'm not sure how to implement it? Any help is greatly appreciated!