Java script only runs in preview; not when launching the Study

Hi there,
My knowledge about java script is very basic; but I found this very cool java script online where participants can move two circles to indicate how close they feel to another person.
I have put the java script into the question and in the preview it works fine. However, if I activate the survey and then click on the link, it does not work anymore. When i try to put this question with the circles at the beginning of the survey it works well for some reason.
Can someone help?

Thanks a lot!