function randomImage()
{
	var imageArray = new Array()
	var site = "http://c4.cabrillo.edu/";
	
	imageArray[0]  = site + 'images/benzo_pyrene.jpg';
	imageArray[1]  = site + 'images/helix69.jpg';
	imageArray[2]  = site + 'images/insulin.jpg';
	imageArray[3]  = site + 'images/morphine.jpg';
	imageArray[4]  = site + 'images/16srna.jpg';
	imageArray[5]  = site + 'images/basepairs.jpg';
	imageArray[6]  = site + 'images/aspartame.jpg';
	imageArray[7]  = site + 'images/lsd.jpg';
	imageArray[8]  = site + 'images/theophylline.jpg';
	imageArray[9]  = site + 'images/progesterone.jpg';
	imageArray[10] = site + 'images/buckyballs.jpg';
	imageArray[11] = site + 'images/sodium_borohydride.jpg';
	imageArray[12] = site + 'images/molecules.jpg';
	
	
	var imageLength = imageArray.length;
	var whichImage = Math.round(Math.random() * (imageLength-1));

	function showImage () {
		document.write("<img src='" + imageArray[whichImage] + "'>");
	}
	
	showImage();
}