Spilt milk. Some keys not working. External keyboard?

I have a 2009 macbook.  My daughter spilt some milk on the keyboard and now a few of the keys won't work.  One of the keys is used in the password I use to get the desktop.  Can I hook in an external keyboard and override the laptop keyboard?
Are there any other solutions to this problem?  I need to get in to computer to backup some files.
Cheers
aaapow

I am sorry, but to get your issue more exposure, I would suggest posting it in the commercial forums, since this is a commercial product. You can click here for the link.
HP ProBook 4540s Notebook PC Support
TwoPointOh
I work on behalf of HP
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    Hope this helps, for any further queries reply to the post and feel free to join us again
     **Click the White Thumbs Up Button on the right to say Thanks**
    Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.
    Thank You,
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    Although I am an HP employee, I am speaking for myself and not for HP

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