How to resolve a deadlock in MySQL?

When I start new transaction in MySQL sometimes I get an error:

(1205) Lock wait timeout exceeded; try restarting transaction

How can I resolve this deadlock in such case? In other words, I want to KILL the transaction which created this deadlock. Can I do this?
technoparkcorpAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
that error is NOT a deadlock, but a simple lock.

now, to find the session, I found nothing but some forum entry saying:
<...>
Run mysqladmin debug
Then, the list of locks will be listed in the error log file.
<...>

hope this helps
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technoparkcorpAuthor Commented:
I want to kill a transaction right from my PHP script. Not manually from console
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technoparkcorpAuthor Commented:
in other words, how can I kill ALL transactions in MySQL?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
the simplest would be the restart MySQL.
otherwise, to see all sessions:
http://dev.mysql.com/doc/refman/5.0/en/show-processlist.html

to kill a session:
http://dev.mysql.com/doc/refman/5.0/en/kill.html
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technoparkcorpAuthor Commented:
any chance to kill a transaction?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
yes. see the last link above for the syntax.
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