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function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		NavPole3_01_ImageMap_06_over = newImage("/images/ESFM/NavPole3_01-ImageMap_06_ove.gif");
		NavPole3_01_ImageMap_05_over = newImage("/images/ESFM/NavPole3_01-ImageMap_05_ove.gif");
		NavPole3_01_ImageMap_04_over = newImage("/images/ESFM/NavPole3_01-ImageMap_04_ove.gif");
		NavPole3_01_ImageMap_03_over = newImage("/images/ESFM/NavPole3_01-ImageMap_03_ove.gif");
		NavPole3_01_ImageMap_02_over = newImage("/images/ESFM/NavPole3_01-ImageMap_02_ove.gif");
		NavPole3_01_ImageMap_01_over = newImage("/images/ESFM/NavPole3_01-ImageMap_01_ove.gif");
		NavPole3_01_ImageMap_07_over = newImage("/images/ESFM/NavPole3_01-ImageMap_07_ove.gif");
		preloadFlag = true;
	}
}
<!-- End Preload Script -->