It looks like the full error is:
Warning: strpos() [
function.strpos: Empty needle in
/home/content/05/11651305/html/marketing1to1/CSSMenuWriter/cssmw_home/menu.php
on line 10
If you attach a copy of that menu.php file and I'll take a look.
Incidentally, this is just a warning and not an error. An adequate solution may be to turn off warnings.