// JavaScript Document
function showhide(id){
if(document.getElementById){
if(document.getElementById(id).style.display == "block"){
document.getElementById(id).style.display = "none";
}else{
document.getElementById("d1").style.display = "none";
document.getElementById("d2").style.display = "none";
document.getElementById("d3").style.display = "none";
document.getElementById(id).style.display = "block";
}
}
}