img1 = new Image();
img1.src = "images/mb-nav01-off.jpg";
img1o = new Image();
img1o.src = "images/mb-nav01-on.jpg";

img2 = new Image();
img2.src = "images/mb-nav02-off.jpg";
img2o = new Image();
img2o.src = "images/mb-nav02-on.jpg";

img3 = new Image();
img3.src = "images/mb-nav03-off.jpg";
img3o = new Image();
img3o.src = "images/mb-nav03-on.jpg";

img4 = new Image();
img4.src = "images/mb-nav04-off.jpg";
img4o = new Image();
img4o.src = "images/mb-nav04-on.jpg";

if (navigator.appName=="Netscape" && parseFloat(navigator.appVersion)<=4.9) {

var strBrowserVer = "NoNo";
}
else {

var strBrowserVer= "YesYes";

}


function domSwap(what){

if (strBrowserVer != "NoNo") {

theImg=document.getElementById("myImage" + what);
theImg.setAttribute("src","images/mb-nav0" + what + "-on.jpg");

}

}

function domSwapBack(what){
if (strBrowserVer != "NoNo") {

theImg=document.getElementById("myImage" + what);
theImg.setAttribute("src","images/mb-nav0" + what + "-off.jpg");
}
}