function whichImage(size)
{
   today=new Date();
   jran=today.getTime();
   var number = 6;
   var random_number="";
   var image="/ffl/media/";
   var text_color="";
   ia=9301;
   ic=49297;
   im=233280;
   jran = (jran * ia + ic) % im;
   random_number = Math.ceil((jran / (im * 1.0)) * number);
   if (random_number==1)
   {
      image+="fred1_" + size + ".png";
   }
   if (random_number==2)
   {
      image+="fred2_" + size + ".png";
   }
   if (random_number==3)
   {
      image+="fred3_" + size + ".png";
   }
   if (random_number==4)
   {
      image+="fred4_" + size + ".png";
   }
   if (random_number==5)
   {
      image+="fred5_" + size + ".png";
   }
   if (random_number==6)
   {
      image+="fred6_" + size + ".png";
   }
   return image;
}

function changeImage(imageName, size)
{
   document[imageName].src=whichImage(size);
}