function image() {
};

image = new image();
number = 0;

image[number++] = "<img src='../images/nieuws/sGravenzand_01.jpg' alt='Zomer1' width='224' height='168' title='Zomer1' border='1' >"
image[number++] = "<img src='../images/nieuws/sGravenzand_02.jpg' alt='Zomer2' width='224' height='168' title='Zomer2' border='1'>"
image[number++] = "<img src='../images/nieuws/sGravenzand_03.jpg' alt='Zomer3' width='224' height='168' title='Zomer3' border='1'>"

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

document.write(image[increment]);