jQuery(document).ready(function(){
   showNext();
   jQuery(function() {
       setInterval( "showNext()", interval );
   });

}); /* end jQuery(document).ready() */

var slide=1;
var p_or_t = "p";
var cycle = 1;

function showNext() {
   if (slide > 3) { 
      /*jQuery("#slideshow img").fadeOut(2000);*/
      slide = 1;
      cycle++;
      if(!document.getElementById('s1p' + cycle)) cycle = 1;
   } else {
      if (p_or_t == "p") { jQuery("#s" + slide + " img").fadeOut(500); }

      jQuery("#s" + slide + p_or_t + cycle).fadeIn(2000);
      if (p_or_t == "p") {
         p_or_t = "t";
      } else {
         p_or_t = "p";
         slide++;
      }
   }
}