illegal character

Firebug tells me this:

illegal character
(no name)(input#newtag.form-input-tip Add new tag, Object delay=500 minchars=2)suggest.js (line 40)
(no name)()suggest.js (line 305)
(no name)([input#newtag.form-input-tip Add new tag], function(), undefined)jquery.js (line 11)
(no name)(function(), undefined)jquery.js (line 11)
(no name)(“admin-ajax.php?action=ajax-tag-search”, Object delay=500 minchars=2)suggest.js (line 304)
(no name)()post.js (line 99)
(no name)()jquery.js (line 11)
(no name)()jquery.js (line 11)
(no name)([function(), function(), function(), 2 more…], function(), undefined)jquery.js (line 11)
(no name)()

and of course:

tinyMCE is not defined…

when I’m trying to write new posts and pages…what to do, what to do??