Problem with nanoslider captions

[leopaneo]

Hi all
I tried looking for this issue but couldn't find it in the forums - although I'm not very good at searching in a foreign language. Sorry if that has already been posted.

I am setting up a slideshow with nanoslider from a web folder. here is the sample code:
(%nanoslider
kind=url
&maxWidth=750px
&listImagesBaseURL=http://www.mysite.com/data/uploads/slideshow_en/
&listImages=01.png|02.png
&listCaptions=Type_here_Something|That_is_very_good
&listURLs=http://ecomm.mysite.com|http://help.mysite.com
&nivoOptions="effect":"random","pauseOnHover":false,"randomStart":true,"pauseTime":4000}
&theme=nano
%)

Now it's all working fine but the captions are not showing correctly:
the first one (Type_here_Something) reads Type[SPACE]here_something and the second one reads that_is_very_good
If, however, I remove the _ from the captions, both will read:
typeheresomething and thatisverygood

so basically either there are _ instead of [SPACE], or all the words are together with no space.

any idea please?
thanks
leo

EDIT: straight after posting, it occurred to me I could put %20 instead of spaces, and it works. a bit an annoyance, but hey.
leaving the post here in case someone has a better suggestion, or the same issue.

cheers!