Browser asing for username/password

Hi Guys,

I've and application running over the net and the problem is that everytime is asking me for the server's username/password, by providing the credentials I'm able to access the page, but how can I avoid that?

this what I have in my web config file, i removed the the whole <authentication> tag but still the same thing

 <authentication mode="Windows">
            <forms loginUrl="~/Public/daLogin.aspx" defaultUrl="~/Public/Default.aspx" name=".ASPXAUTH" path="/" />
        </authentication>
        <authorization>
            <deny users="?" />
            <allow users="*" />
        </authorization>
        <roleManager enabled="true" />

thanks