<table>
  <tr>
    <td class="nowrap" "bunch of inline stuff"></td>
    <td "bunch of inline stuff">
  </tr>
</table>

//$('#main_content_wrapper table:first tbody tr td:nth-child(1)').attr('width','240').attr('id','ezweb_lhr').css('background','lime');
//$("#main_content_wrapper table:first td:nth-child(1)").attr('width','240').attr('id','ezweb_lhr').css('background','lime');
//$("#main_content_wrapper table:first tr:nth-child(1) td:nth-child(1)").attr('width','240').attr('id','ezweb_lhr').css('background','lime');
//$("#main_content_wrapper table tr:nth-child(1) td:nth-child(2)").attr('width','680').attr('id','ezweb_content').css('padding-left','20px').css('background','red');

$("#main_content_wrapper table:first").find("td")

var nth_elem = $("#main_content_wrapper table:first").find("td")[n-1]

$("main_content_wrapper table:first").find("tr:first").find('td');

$("#main_content_wrapper table:first").find("tr:first").find('td')
    .attr({
        'width': '240',
        'id' : 'ezweb_1hr'
    }).css('background','lime');

$("#main_content_wrapper table:first tbody tr:first td[width='647']")