Give this as try, in the form that displays the job listings you need to make your input names like this:
<input type='checkbox' name='jobid[]' value='<?=$jobid?>'>
then in the php page that deletes the jobs you would do something like this:
foreach($jobid as $value) {
$query = 'delete from table where jobid = $value';
}
Make Sence?
-Cy