var maxPromo = 5;
var startpromo = 1;
var prevpromo = 0;
 function chPromo()
 {
   if (prevpromo != 0)
   {
     $('promo_slide_' + prevpromo).fade();
     if (prevpromo == maxPromo)
     {
       prevpromo = 1;
     }
     else
     {
       prevpromo++;
     }
   }
   else
   {
     prevpromo++;
   }
   $('promo_slide_' + startpromo).appear();
   if (startpromo == maxPromo)
   {
     startpromo = 1;
   }
   else
   {
     startpromo++;
   }
 }
 chPromo();
 setInterval("chPromo();", 10000);