а что означает ошибка НТТР 406

Из официального описания ошибки:
Internet Explorer может получать сведения с веб-узла, но не может отображать сведения такого формата.

Это означает что те данные которые находятся на запрашиваемой Вами странице браузер попросту не может отобразить.

коды 400..499 означают ошибку клиента,
в частности ошибка 406 --означает неприемлемый адрес ( not acceptable)

Скачай Mozilla или Opera и живи спокойно...)))

406 Not Acceptable

The resource identified by the request is only capable of generating
response entities which have content characteristics not acceptable
according to the accept headers sent in the request.

Unless it was a HEAD request, the response SHOULD include an entity
containing a list of available entity characteristics and location(s)
from which the user or user agent can choose the one most
appropriate. The entity format is specified by the media type given
in the Content-Type header field. Depending upon the format and the
capabilities of the user agent, selection of the most appropriate
choice may be performed automatically. However, this specification
does not define any standard for such automatic selection.

Note: HTTP/1.1 servers are allowed to return responses which are
not acceptable according to the accept headers sent in the request.
In some cases, this may even be preferable to sending a 406
response. User agents are encouraged to inspect the headers of an
incoming response to determine if it is acceptable. If the response
could be unacceptable, a user agent SHOULD temporarily stop receipt
of more data and query the user for a decision on further actions.