[support] How can I add code that will call javascript within a block every minute for Drupal 6

I have a block that contains javascript which calls a website that sends an ad to this block (see below: Note: I changed the domain name to adserveringwebsite). How can I add code that will call the below javascript every minute so that a different ad will show up every minute instead of just one ad at page load? <SCRIPT type="text/javascript" LANGUAGE="javascript" src=" http://www.qksz.net/1e-kn60"> </SCRIPT> Thanks, John