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The Validator flags an & in a href as invalid this would be the only place it would be valid as if you tryed to send & though the address bar any thing that followed it would not be sent correctly as ; is a break in a GET parameter sent to a page Example Code <a class="thickbox" href="../../../index.php/login/#TB_inline?height=200&width=200&inlineId=form">Log In</a> Given Result Line 44, Column 731: & did not start a character reference. (& probably should have been escaped as &.)
& in href IS invalid. Use & instead.