var imageArray = new Array(3);

 imageArray[0] = "images/bg_00.jpg";
 imageArray[1] = "images/bg_01.jpg";
 imageArray[2] = "images/bg_02.jpg";
 imageArray[3] = "images/bg_03.jpg";
 
 imageArray[4] = "images/bg_11.jpg";
 imageArray[5] = "images/bg_12.jpg";
 imageArray[6] = "images/bg_13.jpg";
 imageArray[7] = "images/bg_14.jpg";
 imageArray[8] = "images/bg_15.jpg";
 imageArray[9] = "images/bg_16.jpg";
 imageArray[10] = "images/bg_17.jpg";
 imageArray[11] = "images/bg_18.jpg";
 imageArray[12] = "images/bg_19.jpg";
 
 imageArray[13] = "images/nav_01.jpg";
 imageArray[14] = "images/nav_02.jpg";
 imageArray[15] = "images/nav_03.jpg";
 imageArray[16] = "images/nav_04.jpg";
 imageArray[17] = "images/nav_05.jpg";
 imageArray[18] = "images/nav_06.jpg";
 imageArray[19] = "images/nav_07.jpg";
 imageArray[20] = "images/nav_08.jpg";
 imageArray[21] = "images/nav_09.jpg";

 for (i=0; i < imageArray.length; i++) {
	 var preload = new Image();
	 preload.src = imageArray[i];
	 }