function show(id) 
{
document.getElementById(id).style.display = "block";
}

function hide(id) 
{
document.getElementById(id).style.display = "none";
}

function flipVisibility(id)
{
var current = "";
current = document.getElementById(id).style.display;
if(current == 'none') { document.getElementById(id).style.display = "block"; }
else {document.getElementById(id).style.display = "none";}	
}