//definovani obrazku pro funkce imgOn() a imgOff()
if (document.images) {
	img1on = new Image();      
	img1on.src = "images/brown/uvod_CZ_brown-02.jpg"; 
	img2on = new Image();
	img2on.src = "images/brown/uvod_CZ_brown-03.jpg"; 
	img3on = new Image();
	img3on.src = "images/brown/uvod_CZ_brown-04.jpg";
	img4on = new Image();
	img4on.src = "images/brown/uvod_CZ_brown-05.jpg";
	img5on = new Image();
	img5on.src = "images/brown/uvod_CZ_brown-06.jpg";
	
	img1off = new Image();
	img1off.src = "images/black/uvod_CZ_black-02.jpg";
	img2off = new Image();
	img2off.src = "images/black/uvod_CZ_black-03.jpg";
	img3off = new Image();
	img3off.src = "images/black/uvod_CZ_black-04.jpg";
	img4off = new Image();
	img4off.src = "images/black/uvod_CZ_black-05.jpg";
	img5off = new Image();
	img5off.src = "images/black/uvod_CZ_black-06.jpg";
	}

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

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