function changeTopic(idNum)
{ var size = 3; var topics=new Array(size)
topics[0] = "about"; topics[1] = "design"; topics[2] = "other";
for(i=0; i < size; i++)  {document.getElementById(topics[i]).style.display='none';} document.getElementById(topics[idNum]).style.display='block';
}

function toggle( targetId ){
if (document.getElementById){
target = document.getElementById( targetId );
if (target.style.display == "none"){
target.style.display = "";
 } else {	
target.style.display = "none";}
}}