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download and edit this file: modules/system/templates/blocks/system_block_mainmenu.html
remove this code:
<a class="menuTop" href="<{$xoops_url}>/"><{$block.lang_home}></a>
reupload to the server, go to system admin, modules and update the systemmodule (that will reload all the templates, including the one you just edited
)
Herko