numItems = 5;
curItem = 0;
path = "images/";

// Initialize images
var menuOn = new Array();
var menuOff = new Array();

for (i=1; i<=numItems; i++)
    {
    menuOn[i] = new Image();
    menuOn[i].src = path + "btn" + i + "_on" + ".gif";
    menuOff[i] = new Image();
    menuOff[i].src = path + "btn" + i + "_off" + ".gif";
    }


function imgOn(n)
    {
    document["btn"+n].src = menuOn[n].src;
    }

function imgOff(n)
    {
    if (curItem != n) {document["btn"+n].src = menuOff[n].src;}
    else {document["btn"+n].src = menuOn[n].src;}
    }