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

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

	if (document.images) {
		Abt_over = newImage("img1/Abt-over.gif");
		Spec_over = newImage("img1/Spec-over.gif");
		What_over = newImage("img1/What-over.gif");
		Cont_over = newImage("img1/Cont-over.gif");
		Perf_over = newImage("img1/Perf-over.gif");
		Proj_over = newImage("img1/Proj-over.gif");
		Pict_over = newImage("img1/Pict-over.gif");
		Hm_over = newImage("img1/Hm-over.gif");
}