valid jquery growth fails production

i am minute sincerely simple book controlling jquery. however, book behaves differently depending presumably i am controlling internal web server (localhost) prolongation server.

on development, following formula advantage html i'm expecting:

$('#objid').siblings('.maddress').html();

on production, same matter advantage undefined.

the request structures same both machines. wholly inadequacy i i firebug step by script. growth machine, putting watch $('#objid').siblings('.maddress') law [ span#object ] while prolongation same watch law [ [ span#object ] ]

(notice double sets retard brackets).

any ideas?

added:

i've accurate twin libraries identical.

i've finished some-more experimenting controlling firebug. another biased book grabs set elements controlling statement:

$('.parentcolumn2').each(function(i) { ... })

within physique function, i set watch this, growth value this i expect: div.parentcolumn2 , nonetheless prolongation value this advantage looks an array: [ div.parentcolumn2, div.parentcolumn2, div.parentcolumn2, .....]

the html fundamentally list (i've bare out irrelevant html, rows repeat):

<table>  
 <tr>  
  <td>  
    <div class="itemtemplate">  
      <div class="parentcolumn2">  
        <div><span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_lbl_address" class="lbl_address maddress">111 w wacker dr, </span><span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_lbl_city" class="lbl_address mcity">chicago</span>&nbsp;<span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_lbl_postalcode" class="lbl_address mpostalcode">60601</span>&nbsp;<a href="javascript:mapme(this);" id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_hypmap" class="hypmap">map</a>&nbsp;&nbsp;<span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_lbl_area" class="marea">loop</span><span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_lt" class="mlt">41.8868010285473</span><span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl02_lg" class="mlg">-87.6312860701286</span>  
        </div>  
      </div>  
    </div>  
  </td>  
 </tr>  
 <tr>  
  <td>  
    <div class="itemtemplate">  
      <div class="parentcolumn2">  
        <div><span id="dnn_ctr45874_viewprojectgrid_gridview1_ctl03_lbl_address" class="lbl_address maddress">...</span> ...  
        </div>  
      </div>  
    </div>  
  </td>  
 </tr>  
</table>

the html relating between twin machines illusory given it's generated .net (don't me started).