function image() {
};

image = new image();
number = 0;

// imageArray
image[number++] = "<img src='slike/random/1.jpg' border='0'>"
image[number++] = "<img src='slike/random/2.jpg' border='0'>"
image[number++] = "<img src='slike/random/3.jpg' border='0'>"
image[number++] = "<img src='slike/random/4.jpg' border='0'>"
image[number++] = "<img src='slike/random/5.jpg' border='0'>"
image[number++] = "<img src='slike/random/6.jpg' border='0'>"
// keep adding items here...

increment = Math.floor(Math.random() * number);