var aryImages = new Array();

aryImages[1] = "/sites/all/themes/tcf/images/image_hm_story-lrg_trailYouth-1.jpg";
aryImages[2] = "/sites/all/themes/tcf/images/image_hm_story-lrg_artscape-1.jpg";
aryImages[3] = "/sites/all/themes/tcf/images/image_hm_story-lrg_dpnc-1.jpg";
aryImages[4] = "/sites/all/themes/tcf/images/image_hm_story-sml_trailYouth-1_on.jpg";
aryImages[5] = "/sites/all/themes/tcf/images/image_hm_story-sml_artscape-1_on.jpg";
aryImages[6] = "/sites/all/themes/tcf/images/image_hm_story-sml_dpnc-1_on.jpg";

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

function swap(imgIndex, imgTarget) {
	document[imgTarget].src = aryImages[imgIndex];
}