def wait_for_condition(self,script,timeout):
self.do_command("<STR_LIT>", [script,timeout,])<EOL>
Runs the specified JavaScript snippet repeatedly until it evaluates to "true".
The snippet may have multiple lines, but only the result of the last line
will be considered.


Note that, by default, the snippet will be run in the runner's test window, not in the window
of your application.  To get the window of your application, you can use
the JavaScript snippet ``selenium.browserbot.getCurrentWindow()``, and then
run your JavaScript in there


'script' is the JavaScript snippet to run
'timeout' is a timeout in milliseconds, after which this command will return with an error