function banner() {
};

banner = new banner();
number = 0;

// bannerArray
banner[number++] = "<img src='images/al_ahzab57.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_anaam163.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_anfal21.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_anfal25.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_anfal28.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_nahil107.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_omran32.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_tawba52.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/al_tawba120.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/sabaa27.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/sabaa49.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/sabaa50.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/yonis52.jpg' width=400 height=120 border=0 alt='Image Header'>"
banner[number++] = "<img src='images/yonis70.jpg' width=400 height=120 border=0 alt='Image Header'>"
// keep adding items here...

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

document.write(banner[increment]);