I looked really hard to find this answer, and I don't think it was actually completed nicely. To save someone else the trouble I just spent 4 hours on. I am going to recap the exact procedure I got to add a new extra button to the nave of water drop based theme (which has an almost blank theme.php file)
1. replace the theme.php file in water drop's existing theme thusly:
goto the "Sample" theme in the coppermine/theme directory:
copy everything (about the first 180 lines)down to and including this:
/******************************************************************************
** Section <<<THEME_HAS_NO_SYS_MENU_BUTTONS>>> - END
******************************************************************************/
Open up the theme.php file in the "water drop theme" and paste that whole copy right over top of everything in the theme that is there already.
So now the theme.php file has something to work with.
--------------------------------------------------------------------
2. To put an extra button on the nav (other than the one from config...so say your 2nd, third, fourth...buttons) you clone ONE line. replace the token kinda things with english and the url, and you are done thusly:
The line you are looking for is:
+++++++++++
addbutton($sys_menu_buttons,'{MY_GAL_LNK}','{MY_GAL_TITLE}','{MY_GAL_TGT}','my_gallery',$t
emplate_sys_menu_spacer);
+++++++++++++++++++++++++
this seems to be the code that makes the "my gallery" button on the nav (any of these lines will work there are 4 or 5 similar ones except for the labels)
so clone that line getting this:
+++++++++++++++++++++++++++++++++
addbutton($sys_menu_buttons,'{MY_GAL_LNK}','{MY_GAL_TITLE}','{MY_GAL_TGT}','my_gallery',$t
emplate_sys_menu_spacer);
addbutton($sys_menu_buttons,'{MY_GAL_LNK}','{MY_GAL_TITLE}','{MY_GAL_TGT}','my_gallery',$t
emplate_sys_menu_spacer);
++++++++++++++++++++++++++++++++++
then in the second one replace {MY_GAL_LNK} {MY_GAL_TITLE} {MY_GAL_TGT} my-gallery
with actual english and the url (keeping the single quotes).So i wanted a link to google, so i ended up with:
------------------------------------------------------------------
addbutton($sys_menu_buttons,'{MY_GAL_LNK}','{MY_GAL_TITLE}','{MY_GAL_TGT}','my_gallery',$t
emplate_sys_menu_spacer);
addbutton($sys_menu_buttons,'googlelink','go to google','
http://www.google.com','google',$template_sys_menu_spacer);
------------------------------------------------------------------------
those two lines make changes to the nav to add a new link that shows up as "googlelink" in this case.
eg: Home* my gallery * googlelink * contact * etc
-----------------------------------------------------
You don't have to change any other code. If you want more buttons, just clone that line
again and fill in the text for the link and the url, you can put them in whatever order you want to move them around..
It seems to work, so i hope that helps. I realize this is an older thread, but I really couldnt find the actual answer so there it is.