browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion); 
if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; }
else { roll = 'false'; }

if (roll=='true')
{
a1=new Image(101,24);a1.src="images/BtnHomeActive.jpg";
a2=new Image(111,24);a2.src="images/BtnPeopleActive.jpg";
a3=new Image(128,24);a3.src="images/BtnProjectsActive.jpg";
a4=new Image(172,24);a3.src="images/BtnPublicationsActive.jpg";

}

function buttontracker (currentselect) {
this.currentselect = currentselect;
}

function DoClick(theLink) {
//MakeNormal(tracker.currentselect);
//MakeActive(theLink);
tracker.currentselect = theLink;
}

function DoActive(theLink) {
//if(theLink != tracker.currentselect)
MakeActive(theLink);
}

function DoNormal(theLink) {
//if(theLink != tracker.currentselect)
MakeNormal(theLink);
}

function MakeInactive(theLink) {
if(theLink==1)
document.homelink.src="images/BtnHome.jpg";
if(theLink==2)
document.peoplelink.src="images/BtnPeople.jpg";
if(theLink==3)
document.projectslink.src="images/BtnProjects.jpg";
if(theLink==4)
document.publicationslink.src="images/BtnPublications.jpg";
}

function MakeNormal(theLink) {
if(theLink==1)
document.homelink.src="images/BtnHome.jpg";
if(theLink==2)
document.peoplelink.src="images/BtnPeople.jpg";
if(theLink==3)
document.projectslink.src="images/BtnProjects.jpg";
if(theLink==4)
document.publicationslink.src="images/BtnPublications.jpg";
}

function MakeActive(theLink) {
if(theLink==1)
document.homelink.src="images/BtnHomeActive.jpg";
if(theLink==2)
document.peoplelink.src="images/BtnPeopleActive.jpg";
if(theLink==3)
document.projectslink.src="images/BtnProjectsActive.jpg";
if(theLink==4)
document.publicationslink.src="images/BtnPublicationsActive.jpg";
}