Can't login to admin site after altering admin template

[Monk22]

so, i was digging around in the google analytics stuff and thought it might be interesting to place the tracking code on my admin site as well as the test site itself. i inserted the tracking script into admin.master template and uploaded it. Reset the cache and now when i log in to the admin site it throws up the big red button and says there was an error encountered.

so i replaced the template with the original but im still getting this message. i assume the cache needs to be reset again? how could i do that without having access to the admin page?

thanks

[Monk22]

i had uploaded the wrong template so thats fixed up now. although when i log in, while typing my username in there is now "!!" in red at the end of the input box. whats that mean?