function show_uwe() {document.getElementById("content_home_uwe").style.visibility="visible";}
function close_uwe() {document.getElementById("content_home_uwe").style.visibility="hidden";}
function show_lea() {document.getElementById("content_home_lea").style.visibility="visible";}
function close_lea() {document.getElementById("content_home_lea").style.visibility="hidden";}
function show_alex() {document.getElementById("content_home_alex").style.visibility="visible";}
function close_alex() {document.getElementById("content_home_alex").style.visibility="hidden";}