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) {
		index_05_over = newImage("images/index_05-over.gif");
		index_07_over = newImage("images/index_07-over.gif");
		index_08_over = newImage("images/index_08-over.gif");
		index_09_over = newImage("images/index_09-over.gif");
		index21_aS_l-over = newImage("images/index21_aS_l-over.gif");
		index22_pB_l-over = newImage("images/index22_pB_l-over.gif");
		index23_query-over = newImage("images/index23_query-over.gif");
		index24_download-over = newImage("images/index24_download-over.gif");
		preloadFlag = true;
	}
}