[jQuery] old tablesorter works, new one doesn't

[lamp5matt]

I inherited an app with a lot of tablesorter implementations, but
wanted the zebra functionality -- alternating css-styled rows -- so i
upgraded.

Now I'm getting
Error: $("#writer-table").tableSorter is not a function

If I revert to the jquery.tablesorter.js file that I inherited (not
sure what version, but at least 6 mos. old), it works but no zebra
functionality.