var prefix = new Array( "goodbadgrad" , "grad" , "graygrad");
var dir = 'http://efoodi.com/resources/images/gradimgs/';
var N = 9;
var N2 = 4;

var preloaded = new Array();
preload_images();
function preload_images() {  
  prei = 0;
  for (pi = 0; pi < prefix.length; pi++)
    for (i=0;i<N;i++) {      
      iplusone = i + 1;      
      if ( i!=N2 ) {
	preloaded[prei] = document.createElement('img'); 
	preloaded[prei].setAttribute('src', dir + prefix[pi] + '_' + iplusone + '.jpg');	
	prei++;
      } else {
	for (j=0;j<2;j++) {
	  jplusone = j + 1;
	  preloaded[prei] = document.createElement('img'); 
	  preloaded[prei].setAttribute('src', dir + prefix[pi] + '_' + iplusone + '_' + jplusone + '.jpg');	
	  prei++;
	}
      }
    }
}