ie6 redirect problem

my django project works fine with firefox4 and ie7 , but login fails
in ie6 and shows:

MultiValueDictKeyError at /accounts/login/
"Key 'username' not found in <QueryDict: {}>"

In fact the html form sends nothing .I've googled before and found
that ie6 changes "post" to "get" when redirects.but I tried "get"
forms, nothing changed. what can i do for my ie6 users?
any programming trick? , for example not using
"HttpResponseRedirect" , or a little patch to fix ie6?

thank you

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