check button in table field to select multiple rows (asp.net)

I searched the related questions and can't find something that works for me.

I have a page, where I have to fill in different text boxes (some mandatory, others not). One of them when you click opens a table that has different columns with data.

the first column is a button that selects the entire row, I would need that button to become a check so I can select multiple rows, not just one.

keep in mind that this is in javascript

This is the data that I must change:

 "<td><a href='#' class='btn btn-minier btn-inverse' onclick='return confirmarDato(" + '"' + est[i]._ID + '"' + "," + '"' + est[i]._DATO + '"' + ")'>Select</a> </td>" +