function newImage(arg) {
if (document.images) {
rslt = new Image();
rslt.src = arg;
return rslt;
}
}
function changeImagesArray(array) {
if (preloadFlag == true) {
var d = document; var img;
for (var i=0; i<array.length; i+=2) {
img = null; var n = array[i];
if (d.images) {img = d.images[n];}
if (!img && d.getElementById) {img = d.getElementById(n);}
if (img) {img.src = array[i+1];}
}
}
}
function changeImages() {
changeImagesArray(changeImages.arguments);
}

var preloadFlag = false;
function preloadImages() {
if (document.images) {
pre_menu01 = newImage('/img/menu01_b.gif');
pre_menu02 = newImage('/img/menu02_b.gif');
pre_menu03 = newImage('/img/menu03_b.gif');
pre_menu04 = newImage('/img/menu04_b.gif');
pre_menu05 = newImage('/img/menu05_b.gif');
pre_menu06 = newImage('/img/menu06_b.gif');

preloadFlag = true;
}
}