function image() {
};

image = new image();
number = 0;

// imageArray
image[number++] = "<img src='images/mE_barImage1.jpg' width='573' height='104' border='0'>"
image[number++] = "<img src='images/mE_barImage2.jpg' width='573' height='104' border='0'>"
image[number++] = "<img src='images/mE_barImage3.jpg' width='573' height='104' border='0'>"
image[number++] = "<img src='images/mE_barImage4.jpg' width='573' height='104' border='0'>"
image[number++] = "<img src='images/mE_barImage5.jpg' width='573' height='104' border='0'>"
image[number++] = "<img src='images/mE_barImage6.jpg' width='573' height='104' border='0'>"
image[number++] = "<img src='images/mE_barImage7.jpg' width='573' height='104' border='0'>"

// keep adding items here...

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

document.write(image[increment]);