function one()
{
document.images[1].src="duke/image1.jpg"
}

function two()
{
document.images[1].src="duke/image2.jpg"
}

function three()
{
document.images[1].src="duke/image3.jpg"
}

function four()
{
document.images[1].src="duke/image4.jpg"
}

function five()
{
document.images[1].src="duke/image6.jpg"
}