if (document.images) {
nexton = new Image();
nexton.src = "picts/nexton.gif"
nextoff = new Image();
nextoff.src = "picts/nextoff.gif"
backon = new Image();
backon.src = "picts/backon.gif"
backoff = new Image();
backoff.src = "picts/backoff.gif"
colorson = new Image();
colorson.src = "picts/colorson.gif"
colorsoff = new Image();
colorsoff.src = "picts/colorsoff.gif"
}
function img_act(imgName) {
if (document.images) {
imgOn = eval(imgName + "on.src");
document [imgName].src = imgOn;}}
function img_inact(imgName) {
if (document.images) {
imgOff = eval(imgName + "off.src");
document [imgName].src = imgOff;}}