How to find the attribute at col in <th>?

Hi,

I have the following Table setup and am using DataTable/Jeditable to display up the value. I am having issue finding the value of the attribute 'col' in the <th> element.

My current script is below and working fine for all other attributes. Any help would be greatly appreciated.

/* Apply the jEditable handlers to the table */
	$('td', oTable.fnGetNodes()).editable( 'ProjectTimeTableUpdater.jsp', {
		"callback": function( sValue, y ) {
			var aPos = oTable.fnGetPosition( this );		
			oTable.fnUpdate( sValue, aPos[0], aPos[1] );
		},
		"submitdata": function ( value, settings ) {

			return {
				"row_id": this.parentNode.getAttribute('id'),
				"id": this.getAttribute('id'),
				"colName": this.getAttribute('row'),
				"colName": $('th').attr('col'),
				"column": oTable.fnGetPosition( this )[2]
			};
		},

<table>
  <thead>
    <tr>
      <th col="value2"></th>
    </tr>
   </thead>
  <tbody>
     <tr id="value1">
       <td></td>
      </tr>
   </tbody
<table>