sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

var imagenumber = 7 ; 
var randomnumber = Math.random() ; 
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ; 
images = new Array 
images[1] = "includes/magnet.jpg"
images[2] = "includes/quadrupole.jpg"
images[3] = "includes/sld.jpg"
images[4] = "includes/sparktracks.jpg"
images[5] = "includes/tunnel.jpg"
images[6] = "includes/watercolor.jpg"
images[7] = "includes/wizard.jpg"
var image = images[rand1]

links = new Array
links[1] = "images.shtml"
links[2] = "images.shtml"
links[3] = "images.shtml"
links[4] = "images.shtml"
links[5] = "images.shtml"
links[6] = "images.shtml"
links[7] = "images.shtml"
var link = links[rand1]