This function shows snowflake images alternately with a blank image. The blank image has the same color as the background on which the snowflakes are shown.

function slideShow2(){
  var t=1200;
  count++;
  if(count%2>0) // if odd: show an image
  {document.images.slide2.src=im[j].src;
   t=3600;
   if (j<im.length-1) {j++} else {j=0};
  }
 else   // if even: show a blank 
  {document.images.slide2.src='../snowflake/blue/midnite.gif'
  t=1200
  }
  setTimeout('slideShow2()',t);
}