var gid="";
function showbio(id){
if (gid==""){
	document.all("intro").style.visibility="hidden";
}else{
	document.all(gid).style.visibility="hidden";
}
document.all(id).style.visibility="visible";
gid=id;
}
function hidebio(id){gid="";document.all("intro").style.visibility="visible";document.all(id).style.visibility="hidden";}