JavaScript Getting second cell value when clicked on a button on the same row

I did a lot of research but can’t find a solution for this.
How could i get email cell value when i click on the button which is located at the last cell of the same row.

Please check this screenshot for better understanding what i mean

So when i click Button 1, i wanna get Email1 value or when click Button 2, i wanna get N2 cell value.

I found this function but it return the clicked cell value not the one i need:

`

      function getElementID(){
        var tbl = document.getElementById("Results");
      if (tbl != null) {
          for (var i = 0; i < tbl.rows.length; i++) {
              for (var j = 0; j < tbl.rows[i].cells.length; j++)
                  tbl.rows[i].cells[j].onclick = function () { getval(this); };
          }
      }
      function getval(cel) {
          alert(cel.innerHTML);
      }
      }

`

Any help is really appreciated

I found this function but it return the clicked cell value not the one i need: 

`

function getElementID(){
   var tbl = document.getElementById("MyTable");
   if (tbl != null) {
      for (var i = 0; i < tbl.rows.length; i++) {
         for (var j = 0; j < tbl.rows[i].cells.length; j++)
             tbl.rows[i].cells[j].onclick = function () { getval(this); };
          }
      }
    function getval(cel) {
        alert(cel.innerHTML);
      }
      }

`