Simple JavaScript

Hi;
I'm trying to pre-load images *in advance* of other images I am also 
pre-loading. I though if I simply put this code in front of my other JS code:

var original = new Image();
var inGroundPools = new Image();

original.src = "./photos/original.gif";
inGroundPools = "../images/in-ground_pools_main.jpg";

that these two images would load first, but apparently not. Now, these 
images are *not* called by any function. Your advice is appreciated.
TIA,
BenO

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