I've found out where is the error.
I use input types in my form from web forms 2.0. draft recommendation. Opera currently supports such ones like 'email', 'date' and so on. So thus i had the problem with jquery serialize method, because in it's regexp currently there aren't any such types. However in other browsers i use special script from here http://code.google.com/p/webforms2/ to implement the functionality, and using serialize method works nice with such data types, maybe the script dynamically changes them to text.
So then i guess it can be an offer to add search for these new input types to the filter, or make it in different way without such strict rules about type, maybe test if just it is not checkbox, radio and file.
Sorry for wrong bug request.