function image() {
};

image = new image();
number = 0;

// imageArray note file paths!
image[number++] = "<img src='images/pagehead/DNA_Gel.jpg' width='785' height='217' border='0' alt='Winning Intellectual Property' />"
image[number++] = "<img src='images/pagehead/Pill_Bottles.jpg' width='785' height='217' border='0' alt='Winning Intellectual Property' />"
image[number++] = "<img src='images/pagehead/DNA.jpg' width='785' height='217' border='0' alt='Winning Intellectual Property' />"
image[number++] = "<img src='images/pagehead/Pills.jpg' width='785' height='217' border='0' alt='Winning Intellectual Property' />"
image[number++] = "<img src='images/pagehead/Turbine_2.jpg' width='785' height='217' border='0' alt='Winning Intellectual Property' />"

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

document.write(image[increment]);