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(wwwdir) {
	if (document.images) {
		caption_bl_sm = newImage(wwwdir + "_images/caption/caption_bl_sm.gif");
		caption_br_sm = newImage(wwwdir + "_images/caption/caption_br_sm.gif");
		caption_btm_sm = newImage(wwwdir + "_images/caption/caption_btm_sm.gif");
		caption_left = newImage(wwwdir + "_images/caption/caption_left.gif");
		caption_right_sm = newImage(wwwdir + "_images/caption/caption_right_sm.gif");
		caption_tl = newImage(wwwdir + "_images/caption/caption_tl.gif");
		caption_top = newImage(wwwdir + "_images/caption/caption_top.gif");
		caption_tr = newImage(wwwdir + "_images/caption/caption_tr.gif");
		caption_tr_sm = newImage(wwwdir + "_images/caption/caption_tr_sm.gif");
		preloadFlag = true;
	}
}