Re-Populating Checkboxes

[eluser]Gukkie[/eluser]
Hello all, got a little problem here that i need solving, how do i re-populate a checkbox or multiple checkboxes if the form does'nt pass validation?

<li>&lt;?=form_checkbox('reg_interest[]', '1', FALSE);?&gt;<span>Games</span></li>
<li>&lt;?=form_checkbox('reg_interest[]', '2', FALSE);?&gt;<span>TV</span></li>
<li>&lt;?=form_checkbox('reg_interest[]', '3', FALSE);?&gt;<span>Cysling</span></li>
<li>&lt;?=form_checkbox('reg_interest[]', '4', FALSE);?&gt;<span>Swimming</span></li>

any help would be greatly appreciated

Cheers!