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 = 'button/photography.gif';
name0b = new Image;name0b.src = 'button/photography1.gif';
name1a = new Image;name1a.src = 'button/architect.gif';
name1b = new Image;name1b.src = 'button/architect1.gif';
name2a = new Image;name2a.src = 'button/school.gif';
name2b = new Image;name2b.src = 'button/school1.gif';
name3a = new Image;name3a.src = 'button/galleria.gif';
name3b = new Image;name3b.src = 'button/galleria1.gif';
name4a = new Image;name4a.src = 'button/tutorial.gif';
name4b = new Image;name4b.src = 'button/tutorial1.gif';
name5a = new Image;name5a.src = 'button/US.gif';
name5b = new Image;name5b.src = 'button/US1.gif';
name6a = new Image;name6a.src = 'button/alumni.gif';
name6b = new Image;name6b.src = 'button/alumni1.gif';
name7a = new Image;name7a.src = 'button/forum.gif';
name7b = new Image;name7b.src = 'button/forum1.gif';
name8a = new Image;name8a.src = 'button/fun.gif';
name8b = new Image;name8b.src = 'button/fun1.gif';
name9a = new Image;name9a.src = 'button/quiz.gif';
name9b = new Image;name9b.src = 'button/quiz1.gif';
name10a = new Image;name10a.src = 'button/greetings.gif';
name10b = new Image;name10b.src = 'button/greetings1.gif';
name11a = new Image;name11a.src = 'button/thesis.gif';
name11b = new Image;name11b.src = 'button/thesis1.gif';
}
function lighten(imgName) {
if (entrance == 'yes'){
imgOn = eval(imgName + 'b.src');
document[imgName].src = imgOn;}
}
function darken(imgName) {
if (entrance == 'yes'){
imgOff = eval(imgName + 'a.src');
document[imgName].src = imgOff;}
 }
// STOP HIDE -->