[daffy]

post your stdhead mate. that code what joos showed you is what you need to add. you need to add

if(isset($CURUSER)) {

above the block code you wan to hide from guest/login

and

}

goes below the block code so your wrap it around. only current users will see (registered)

so your categories will be from

categories_block("Cats");

to

if(isset($CURUSER)) {
categories_block("Cats");
}