var theImages = new Array();

// theImages[0] = 'path/to/image.jpg'

theImages[0] = '/cms/outertemplates/images/misc/mosaic-image-1.jpg';
theImages[1] = '/cms/outertemplates/images/misc/mosaic-image-2.jpg';
theImages[2] = '/cms/outertemplates/images/misc/mosaic-image-3.jpg';
theImages[3] = '/cms/outertemplates/images/misc/mosaic-image-4.jpg';

var i = 0;
var p = theImages.length;
var preBuffer = new Array();
for (i = 0; i < p; i++) {
    preBuffer[i] = new Image();
    preBuffer[i].src = theImages[i];
}