// JavaScript Document

function change1()
{
document.getElementById('rightcontent1').style.visibility = "visible"; 
document.getElementById('rightcontent2').style.visibility = "hidden"; 
document.getElementById('rightcontent3').style.visibility = "hidden"; 
document.getElementById('rightcontent4').style.visibility = "hidden";
}
function change2()
{
document.getElementById('rightcontent1').style.visibility = "hidden"; 
document.getElementById('rightcontent2').style.visibility = "visible"; 
document.getElementById('rightcontent3').style.visibility = "hidden"; 
document.getElementById('rightcontent4').style.visibility = "hidden";
}
function change3()
{
document.getElementById('rightcontent1').style.visibility = "hidden"; 
document.getElementById('rightcontent2').style.visibility = "hidden"; 
document.getElementById('rightcontent3').style.visibility = "visible"; 
document.getElementById('rightcontent4').style.visibility = "hidden";
}
function change4()
{
document.getElementById('rightcontent1').style.visibility = "hidden"; 
document.getElementById('rightcontent2').style.visibility = "hidden"; 
document.getElementById('rightcontent3').style.visibility = "hidden"; 
document.getElementById('rightcontent4').style.visibility = "visible";
}