images = new Array(1); 
	images[0] = "images/geolabs_0.gif"; 
	images[1] = "images/geolabs_1.gif"; 
	images[2] = "images/geolabs_2.gif"; 
	images[3] = "images/geolabs_3.gif"; 
	images[4] = "images/geolabs_4.gif"; 
	index = Math.floor(Math.random() * images.length); 
	document.write('<img src="' + images[index] + '" width="256" height="160" alt="Geography Department Computer Lab" border="0">');