Show the item width an certain ID that is received by ajax

I have several content items on the page all of the are hidden and they have each a unique ID. #data serves as a temporary stack.

    <div id="data"></div>
    <div id="item1212">...</div>
    <div id="item2323">...</div>
    <div id="item3434">...</div>
    <div id="item4545">...</div>

an Ajaxrequest gives me back a certain ID

$('#data').load('http://someURL');

fills the #data:

<div id="data">2323</div>

width this lines I make my correspondig item visible:

var theID = $('#data').text().val();  
$('#item'+theID).toggleClass('visible');

This was my idea. Guess: Ist does not work cause it fails to read #data and use the value as a string. Its alwas an object (?).

I save the value first in html cause I dont know how to save a ajax-result (its always a string value) to a JS variable.

But I guess you have much better ideas how to solve my Problem: Show item width an certain ID that is receved by ajax