var timer;

function showSlide(num)
{
  counter=num;
  counter%=promotions.length;
  $('.promo-box .img').css('backgroundImage','url('+promotions[counter][0]+')');
  $('.promo-box .name p').html(promotions[counter][1]);
  $('.promo-box a').removeClass('current');
  $('#promo-anchor'+counter).addClass('current');
  
  clearTimeout(timer);
  timer=setTimeout('showSlide(counter+1)',5000);
}