if (top == self) self.location.href = "index.htm";

if (document.images)
{
var but1 = new Image();
var but2 = new Image();
var but3 = new Image();


but1.src = "mc_class_on.gif";
but2.src = "mc_join_on.gif";
but3.src = "mc_home_on.gif";

}

   function turnOn(button) {
      if (document.images)
           {
           document[button].src = button + "_on.gif";
           }}

   function turnOff(button) {
      if (document.images)
           {
           document[button].src = button + "_of.gif";
           }}

//