if (document.images) {
	image1on = new Image();
    image1on.src = "images/dubrovnik1.jpg";
    image1off = new Image();
    image1off.src = "images/dubrovnik.jpg";
   	image2on = new Image();
	image2on.src = "images/trogir1.jpg";
	image2off = new Image();
	image2off.src = "images/trogir.jpg";
	image3on = new Image();
 	image3on.src = "images/zagreb1.jpg";
	image3off = new Image();
	image3off.src = "images/zagreb.jpg";
	image4on = new Image();
	image4on.src = "images/plitvice1.jpg";
	image4off = new Image();
	image4off.src = "images/plitvice.jpg";
	image5on = new Image();
	image5on.src = "images/split1.jpg";
	image5off = new Image();
	image5off.src = "images/split.jpg";
	image6on = new Image();
	image6on.src = "images/zadar1.jpg";
	image6off = new Image();
	image6off.src = "images/zadar.jpg";
}

function changeon(imageNr)  {
     imageName = 'image' + imageNr;
     document[imageName].src = eval(imageName + "on.src");
}

function changeoff(imageNr) {
    imageName = 'image' + imageNr;
    document[imageName].src = eval(imageName + "off.src");
}