Hide Top menu from guests??

Ok so im looking to hide the main top menu from guests to my site and make it only viewable to logged on members, i have set all of the menu items to "members only" through the admin/menu builder, but even though the menu items are not seen by guests it now leaves a gap where the menu is, so im looking for a bit of code to change the menu so only seen by logged in members,

Any ideas would be great, and it's on 7.1.

Thanks

Edit templates/base/scripts/BxBaseMenu.php line 109 add this just after 

function getCode()

    {

Add this

if(!isLogged()) return;

Done. Hope it helps :D

Thanks bud, it worked a treat :)

Cheers..