[jQuery] add class to row object of table

[Potluri]

Hi, 
 My table format is this

<table id="srTable">
<tbody>
 <tr><td>some data</td></tr>
 <tr><td>some data</td></tr>
 <tr><td>some data</td></tr>
 <tr><td>some data</td></tr>
</tbody>
</table>
  I have a small issue which might be easy for jquery pros. 

Initially I'm saving up  all the table rows as suggested by George(Thanks to
him) in my previous post like.

 for( var i = 0, n = trows.length;  i < n;  ++i ) {
      var row = trows[i];
      var col = row.firstChild;
      rows.push({ row:row, col:col, style:row.style, visible:true });
   }  
like 
nRows=rows.length;
for( var i = 0;  i < nRows;  ++i ) {
         var row = rows[i], col = row.col;
  $(row).addClass("bold");
}
The problem is later when I'm trying to add or remove class in jquery
fashion like $(row).addClass("bg_litegray") its giving some error. I think
I'm doing it wrong. Can anyone  of you suggest me how to use this row
similar to $("#srTable tbody tr") in jquery so that I can add class, remove
class, apply filter like $(row).filter('[EMAIL PROTECTED]"refine"]')....etc...

Thanks in advance.
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