if (document.images) {
	  image1off = new Image();
	  image1off.src = "classes.gif";
	  image2off = new Image();
	  image2off.src = "vita.gif";
	  image3off = new Image();
	  image3off.src = "links.gif";

	  image1on = new Image();
	  image1on.src = "classesover.gif";
	  image2on = new Image();
  	  image2on.src = "vitaover.gif";
 	  image3on = new Image();
 	  image3on.src = "linksover.gif";

 
	}

	function changeImages() {
  	if (document.images) {
    	for (var i=0; i<changeImages.arguments.length; i+=2) {
      	document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
   	}
  	}
	}