Slideshow script:

var i=0;

function slideshow (name, names)
// changes -name- image every 3 seconds. Looping.
// -names- list must be comma separated and have no spaces
{
 slide = names.split(",");
 if (i >=slide.length)
 i=0;
 slider = slide[i];
 eval ('document.' + name + '.src ="images/' + slider + '"');
 i++;
 name2 = name;
 names2=names;
 setTimeout ('slideshow (name2, names2);',3000);
}

slideshow ("banner", "squirrel1.jpg,squirrel2.jpg,squirrel3.jpg,squirrel4.jpg,squirrel5.jpg,squirrel6.jpg,squirrel7.jpg,run.jpg");

Preload script:

function preload (names)
// Preloads images - Names variable is a list which is comma separated
// Include extensions
{ 
 var nw = names.split(",");
 for (i=0; i<nw.length; i++)
 { 
  var nwbit = nw[i].split (".");
  eval (nwbit[0] + 'load= new Image();');
  eval (nwbit[0] + 'load.src = "images/'+ nw[i] + '";');
   }
}
preload ("squirrel1.jpg,squirrel2.jpg,squirrel3.jpg,squirrel4.jpg,squirrel5.jpg,squirrel6.jpg,squirrel7.jpg,run.jpg");