//headnav.js - Script to display Navigation Bar
//Copyright Dave Lycett 2005

// function that displays status bar message

function dm(msgStr) {

  document.returnValue = false;

  if (document.images) { 

     window.status = msgStr;

     document.returnValue = true;

  }

}

var showMsg = navigator.userAgent != "Mozilla/4.0 (compatible; MSIE 4.0;)";

function dmim(msgStr) {

  document.returnValue = false;

  if (showMsg) { 

    window.status = msgStr;

    document.returnValue = true;

  }

}
<!--

if (document.images) {
 m1on = new Image();
 m1on.src = "navbar/nav01a.gif";

 m2on = new Image();
 m2on.src = "navbar/nav02a.gif";

 m3on = new Image();
 m3on.src = "navbar/nav03a.gif";

 m4on = new Image();
 m4on.src = "navbar/nav04a.gif";

 m5on = new Image();
 m5on.src = "navbar/nav05a.gif";

 m6on = new Image();
 m6on.src = "navbar/nav06a.gif";

 m7on = new Image();
 m7on.src = "navbar/nav07a.gif";

 m1off = new Image();
 m1off.src = "navbar/nav01.gif";

 m2off = new Image();
 m2off.src = "navbar/nav02.gif";

 m3off = new Image();
 m3off.src = "navbar/nav03.gif";

 m4off = new Image();
 m4off.src = "navbar/nav04.gif";

 m5off = new Image();
 m5off.src = "navbar/nav05.gif";

 m6off = new Image();
 m6off.src = "navbar/nav06.gif";
 
 m7off = new Image();
 m7off.src = "navbar/nav07.gif";
}

function turnOn(imageName) {
 if (document.images) {
 document[imageName].src = eval(imageName + "on.src");
 }
}

function turnOff(imageName) {
 if (document.images) {
 document[imageName].src = eval(imageName + "off.src");
 }
}