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GenericPicker passing custom 'Contains' value

Question asked by timurso on Dec 5, 2008
I'm new to Java architecture (I'm a .NET programmer), but I need to customize Alfresco UI a bit:
I want to pass custom value to pickerCallback of GenericPicker (most preferably with changing just JSP page- I don't want to rebuild Alfresco).
I'm going to add custom JAVA method (or how do you call them? :) ) to invite.jsp page (tomcat\webapps\jsp\wcm\create-website-wizard), so it will extract username from "alfUser" cookie, take only some part of it and pass it to GenericPicker's queryCallback, which has parameter "contains", but I don't actually know how to pass my string there!

any help would be much appreciated,