var browser     = '';
var version     = '';
var entrance    = '';
var cond        = '';
// BROWSER?
if (browser == ''){
if (navigator.appName.indexOf('Microsoft') != -1)
browser = 'IE'
else if (navigator.appName.indexOf('Netscape') != -1)
browser = 'Netscape'
else browser = 'NN';
}
// VERSION?
if (version == ''){
version= navigator.appVersion;
paren = version.indexOf('(');
whole_version = navigator.appVersion.substring(0,paren-1);
version         = parseInt(whole_version);
}
// BROWSER & VERSION
if (browser == 'IE' && version >= 4) entrance = 'yes';
if (browser == 'IE' && version < 4) entrance = 'no';
if (browser == 'Netscape' && version >= 2.02) entrance = 'yes';
if (browser == 'Netscape' && version < 2.02) entrance = 'no';
if (entrance=='yes'){
name0a = new Image;name0a.src = 'gifs/corporate.gif';
name0b = new Image;name0b.src = 'gifs/corporate_on.gif';
name0c = new Image;name0c.src = 'gifs/orb_on.gif';
name1a = new Image;name1a.src = 'gifs/intricate.gif';
name1b = new Image;name1b.src = 'gifs/intricate_on.gif';
name1c = new Image;name1c.src = 'gifs/orb_on.gif';
name2a = new Image;name2a.src = 'gifs/quote.gif';
name2b = new Image;name2b.src = 'gifs/quote_on.gif';
name2c = new Image;name2c.src = 'gifs/orb_on.gif';
name3a = new Image;name3a.src = 'gifs/scope.gif';
name3b = new Image;name3b.src = 'gifs/scope_on.gif';
name3c = new Image;name3c.src = 'gifs/orb_on.gif';
defaultimage = new Image;defaultimage.src = 'gifs/orb_off.gif';
}
function lighten(imgName)
{
    if (entrance == 'yes')
    {
        imgOn = eval(imgName + 'b.src');
        document[imgName].src = imgOn;
        imgOn = eval(imgName + 'c.src')
        document.defimage.src = imgOn;
    }
}
function darken(imgName)
{
    if (entrance == 'yes')
    {
        imgOff = eval(imgName + 'a.src');
        document[imgName].src = imgOff;
        document.defimage.src = defaultimage.src;
    }
}