if (document.images) {
	img1on = new Image();   img1on.src = "pics/akt_on.gif";
	img2on = new Image();   img2on.src = "pics/pcb_on.gif";
	img3on = new Image();   img3on.src = "pics/ust_on.gif";
	img4on = new Image();   img4on.src = "pics/zdr_on.gif";
	img5on = new Image();   img5on.src = "pics/tec_on.gif";
	img6on = new Image();   img6on.src = "pics/dzi_on.gif";
	img7on = new Image();   img7on.src = "pics/cor_on.gif";
	img8on = new Image();   img8on.src = "pics/kontakt_on.gif";

	img1off = new Image();  img1off.src = "pics/akt_off.gif";
	img2off = new Image();  img2off.src = "pics/pcb_off.gif";
	img3off = new Image();  img3off.src = "pics/ust_off.gif";
	img4off = new Image();  img4off.src = "pics/zdr_off.gif";
	img5off = new Image();  img5off.src = "pics/tec_off.gif";
	img6off = new Image();  img6off.src = "pics/dzi_off.gif";
	img7off = new Image();  img7off.src = "pics/cor_off.gif";
	img8off = new Image();  img8off.src = "pics/kontakt_off.gif";
    }

function imgOn(imgName) {
	if (document.images) {
  document[imgName].src = eval(imgName + "on.src");
	}
}

function imgOff(imgName) {
	if (document.images) {
  document[imgName].src = eval(imgName + "off.src");
	}
}