I have successfully written my code, but there is one issue. The first row is starting with the number one instead of zero. I'm looking for suggestions on how to start from zero. Any help would be greatly appreciated. Thanks!
<script>
var tables = document.getElementsByTagName('table');
var table = tables[tables.length - 1];
var rows = table.rows;
for(var i = 0, td; i < rows.length; i++){
td = document.createElement('td');
td.appendChild(document.createTextNode(i + 1));
rows[i].insertBefore(td, rows[i].firstChild);
}