Jake made use of the column index. If it is always the first four columns, this will work.
If it is some other group of columns, you would have to change it a bit.
You will have to remember to change the code if you add or remove columns from the table!
If it might be a different set of columns in each row, you could add a CSS class to the clickable <td>s. It is a bit painful, but less so that adding the URL to each one!