<!--
if (document.images) {
  var nava1 = new Image();
  nava1.src = "nav/button-gray.gif";
  var nava2 = new Image();
  nava2.src = "nav/button-blue.gif";
  var navb1 = new Image();
  navb1.src = "nav/button-gray.gif";
  var navb2 = new Image();
  navb2.src = "nav/button-blue.gif";
  var navc1 = new Image();
  navc1.src = "nav/button-gray.gif";
  var navc2 = new Image();
  navc2.src = "nav/button-blue.gif"; 
  var navd1 = new Image();
  navd1.src = "nav/button-gray.gif";
  var navd2 = new Image();
  navd2.src = "nav/button-blue.gif";
  var nave1 = new Image();
  nave1.src = "nav/button-gray.gif";
  var nave2 = new Image();
  nave2.src = "nav/button-blue.gif";
 

}

function act(imgName) {
  if (document.images) 
   document[imgName].src = eval(imgName + "1.src");
}

function inact(imgName) {
  if (document.images)
   document[imgName].src = eval(imgName + "2.src");
}

// -->