[WhiteDoveGifts]

for create_profile_menu.tpl it's:

{*include file="buttons/button.tpl" button_title=$lng.lbl_register href="register.php" image_menu=true*}

and for the login_menu it's:

{*include file="buttons/button.tpl" button_title=$lng.lbl_log_in href="javascript: document.authform.submit();" js_to_href="Y" image_menu=true type="input"*}

if you want to undo the action just remove both * at the beginning and end of the code. My code might be slighty different from yours since I am using 4.1.8 but the principle of commenting out is the same...