<!-- Begin


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"


}

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;
}
}
function layerOn(whichLayer)
{
    var elem, vis;
    if( document.getElementById ) // this is the way the standards work
        elem = document.getElementById( whichLayer );
    else if( document.all ) // this is the way old msie versions work
        elem = document.all[whichLayer];
    else if( document.layers ) // this is the way nn4 works
        elem = document.layers[whichLayer];
    vis = elem.style;
    vis.display = (vis.visibility == 1)?'none':'block';
}
function layerOff(whichLayer)
{
    var elem, vis;
    if( document.getElementById ) // this is the way the standards work
        elem = document.getElementById( whichLayer );
    else if( document.all ) // this is the way old msie versions work
        elem = document.all[whichLayer];
    else if( document.layers ) // this is the way nn4 works
        elem = document.layers[whichLayer];
    vis = elem.style;
    vis.display = (vis.visibility == 0)?'none':'block';
}

// -->