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Have a look here: http://docu.gsa-online.de/captcha_breaker/imacro
That string has to be replaced yes. But keep in mind that this is imacro, a script language I by myself can not code in as I never tried. The script you see is done by a customer being so polite to share it with us.
Im sorry but some things have to be done by yourself. Please ask somewhere in the imacro community for help. I simply can not. If you have something to add here to improve things you are welcome