tablesorter - can it sort using alternating rows?

tablesorter - can it sort using alternating rows?

Standard HTML table. But the output is weird: a dozen columns of data on a row then the row immediately after it is a colspan of all those columns which contains a random amount of text, but  attached to that row. How can I sort on any of those dozen columns yet maintain the following row still attached to the sorted row?

Example is hard to enter but imagine a table of 3 columns like this:

[table]
[tr]
[td]data1[/td] [td]col2[/td] [td]col3[/td]
[/tr]
[tr]
[td colspan=3]long amount of text here[/td]
[/tr]

...then repeat the above.

I'd like to be able to keep each "odd" row "attached" to its "even" parent above it through the sort process. Is this possible using the tablesorter module?

Thanks for any suggestions!