function rollover(imgName, imgFile, imgFolder) {
  var path;
  if (typeof(imgFolder) == "undefined") path = "/scholastic_thanksgiving/images/" + imgFile;
  else path = "/scholastic_thanksgiving/" + imgFolder + "/images/" + imgFile;
  
  if (document.images){	  
    	document.images[imgName].src = path;
  }
}