Small problem in remember password of Firefox

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C#

I am phasing a problem in my vs 2005 web project, when log in to a website, the Firefox browser automatically asks for remember password, when i click OK, no need to enter my password once again when the time of log in, i just entered OK,it will automatically enters into the site(means the text boxes are already filled), but the problem is, there is a form inside the site haves the text boxes called username and password, when i click into the form, the text boxes username and password already filled with the username and password which is in remember password, but the other fields are empty.I need all the fields should be empty.