Hover captions problem (edited title)

the “caption Hover” tute from the site works well but id like to create multiple hover films -
Id like to, for example alternate the background colour of the hover field as one moves of different buttons.

I know that i cant double the line of code for the start frame on main timeline , eg:

startDrag("_root.caption", true);
startDrag("_root.captionb", true);

any easy way to get this to work??