function image() { }; 
image = new image();
i = 0; 
// imageArray
image[i++] = "<img src='images/home/Forest_Concession.jpg' border='0' alt='UNIFIBER'>"
image[i++] = "<img src='images/home/PT_MAL_Jetty_2.jpg' border='0' alt='UNIFIBER'>"
image[i++] = "<img src='images/home/PT_MAL_Mill.jpg' border='0' alt='UNIFIBER'>"
image[i++] = "<img src='images/home/Wood_and_Chips.jpg' border='0' alt='UNIFIBER'>"
image[i++] = "<img src='images/home/Young_Acacia_Plantation.jpg' border='0' alt='UNIFIBER'>"

increment = Math.floor(Math.random() * i);  document.write(image[increment]);