Are you talking about the original page (publish.htm) that users must have access to install the application? If so, this is just an html page that you can edit as you want.
If you are talking about a security warning that users must click past to install the application, you need to sign your manifest files with a certificate trusted by the client machines. This MSDN link contains some information on how to do this.
http://msdn.microsoft.com/en-us/library/ms996418.aspx
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