if (document.images) {

	var myImages = ["/images/subnav_deckboards_on.gif", "/images/subnav_joists_on.gif", "/images/subnav_balustrading_on.gif"];
	
	for (i = 0; i < myImages.length; i++) {
		foo = 'image' + i;
		foo = new Image();
		foo.src = myImages[i];
	}
	
}

downloadBtn = new Image();
downloadBtn.src = "/images/pdf-button-brochure-on.gif";