var last_id;
function MenuBook(id) {
if(id) {

document.documentElement.style.display="none";

bookhouse.style.display="none";
books.style.display="none";
bookguide.style.display="none";
varioussubjects.style.display="none";
creative.style.display="none";
childrenandadults.style.display="none";
purchases.style.display="none";

if(last_id && last_id!=id)
last_id.style.display='none';
if(id.style.display!='none')
id.style.display='none';
else
id.style.display='inline';
last_id=id;
document.documentElement.style.display="inline";
}
}