function bio(){
visibility='visible'
document.all.barra_bio.style.visibility='visible'
document.all.barra_bio.style.height='40px'
document.all.bio.style.visibility='visible'
document.all.bio.style.height='500px'

document.all.opere.style.visibility='hidden'
document.all.opere.style.height='1px'

document.all.temp.style.visibility='hidden'
document.all.temp.style.height='1px'
}

function opere(){
visibility='visible'
document.all.opere.style.visibility='visible'
document.all.opere.style.height='380px'

document.all.bio.style.visibility='hidden'
document.all.bio.style.height='1px'
document.all.barra_bio.style.visibility='hidden'
document.all.barra_bio.style.height='1px'

document.all.temp.style.visibility='hidden'
document.all.temp.style.height='1px'
}