You can try using a (free) tool I wrote, called scriptdb.exe.
It scripts out all objects (including indexes). The script for each object is created in a separate file. It would be a simple matter to alter the tool so it only scripts the indexes (the source is available so you could do it yourself). Or you can just run it as is and script out all the objects, and throw away what you don't want if all you care about are indexes.