function esconde(div)

{

document.getElementById(div).style.visibility = 'hidden';

}



function mostra(div)

{

document.getElementById(div).style.visibility = 'visible';

}



function alterna(div)

{

vis = document.getElementById(div).style.visibility;

newvis = 'hidden';

if (vis == 'hidden') newvis = 'visible';

document.getElementById(div).style.visibility = newvis;

}