Personas: Dynamic table row selection

Hi all,

I want to dynamically select a table row, according of the content of it's key field column.

In the step in a script button, the selection of the row is something like this:

Now I want to replace the fixed row "2" with some content from a variable.

Does someone have any idea, if this is possible with Javascript or some other technics?

Thanks for your help!

Cheers,

Christian