function cd1() {

document.getElementById("cd1").style.visibility= "visible"; 
document.getElementById("cd1a").style.visibility= "visible"; 
document.getElementById("cd2").style.visibility= "hidden"; 
document.getElementById("cd2a").style.visibility= "hidden"; 
document.getElementById("cd3").style.visibility= "hidden"; 
document.getElementById("cd3a").style.visibility= "hidden"; 
document.getElementById("cd4").style.visibility= "hidden"; 
document.getElementById("cd4a").style.visibility= "hidden"; 
document.getElementById("cd5").style.visibility= "hidden"; 
document.getElementById("cd5a").style.visibility= "hidden"; 
}


function cd2() {

document.getElementById("cd1").style.visibility= "hidden"; 
document.getElementById("cd1a").style.visibility= "hidden"; 
document.getElementById("cd2").style.visibility= "visible"; 
document.getElementById("cd2a").style.visibility= "visible"; 
document.getElementById("cd3").style.visibility= "hidden"; 
document.getElementById("cd3a").style.visibility= "hidden"; 
document.getElementById("cd4").style.visibility= "hidden"; 
document.getElementById("cd4a").style.visibility= "hidden"; 
document.getElementById("cd5").style.visibility= "hidden"; 
document.getElementById("cd5a").style.visibility= "hidden"; 
}

function cd3() {

document.getElementById("cd1").style.visibility= "hidden"; 
document.getElementById("cd1a").style.visibility= "hidden"; 
document.getElementById("cd2").style.visibility= "hidden"; 
document.getElementById("cd2a").style.visibility= "hidden"; 
document.getElementById("cd3").style.visibility= "visible"; 
document.getElementById("cd3a").style.visibility= "visible"; 
document.getElementById("cd4").style.visibility= "hidden"; 
document.getElementById("cd4a").style.visibility= "hidden"; 
document.getElementById("cd5").style.visibility= "hidden"; 
document.getElementById("cd5a").style.visibility= "hidden"; 
}

function cd4() {

document.getElementById("cd1").style.visibility= "hidden"; 
document.getElementById("cd1a").style.visibility= "hidden"; 
document.getElementById("cd2").style.visibility= "hidden"; 
document.getElementById("cd2a").style.visibility= "hidden"; 
document.getElementById("cd3").style.visibility= "hidden"; 
document.getElementById("cd3a").style.visibility= "hidden"; 
document.getElementById("cd4").style.visibility= "visible"; 
document.getElementById("cd4a").style.visibility= "visible"; 
document.getElementById("cd5").style.visibility= "hidden"; 
document.getElementById("cd5a").style.visibility= "hidden"; 
}

function cd5() {

document.getElementById("cd1").style.visibility= "hidden"; 
document.getElementById("cd1a").style.visibility= "hidden"; 
document.getElementById("cd2").style.visibility= "hidden"; 
document.getElementById("cd2a").style.visibility= "hidden"; 
document.getElementById("cd3").style.visibility= "hidden"; 
document.getElementById("cd3a").style.visibility= "hidden"; 
document.getElementById("cd4").style.visibility= "hidden"; 
document.getElementById("cd4a").style.visibility= "hidden"; 
document.getElementById("cd5").style.visibility= "visible"; 
document.getElementById("cd5a").style.visibility= "visible";  
}