Thanks for your reply! I found the solution. In my case,
the particular part is mentioned under 'deny user'(while not logged on) category in web.config.That's y the style sheet was not loaded. I resolved this by mentioned the 'allow user' property.
I m creating a login page in asp.net..i need to use web service method and write stored procedure to check if user name and pwd are correct..if its right then need to direct the user to another page else display an error...since response.redirect wont work in web service can u suggest how to go about it???