Overhead of div tags

I have recently started a new job and find that the code that I am supporting has an overabundance of superfluous <div> tags.  The attached code is scrubbed and provided only to give an example of the overuse of the tags.  To me it makes the code hard to read and maintain.  My question, however, is what sort of overhead if any this adds to the performance.  Is there any sort of a hit with these tags?

Thanks.

<div id="ctl00_x1">
 <span id="ctl00_x2"></span>
  <div id="ctl00_x3" >
   <div style="width: auto; margin: auto;">
    <div>       
     <div id="ctl00_x4" style="width:60px;">
      <img ...
      <span id="ctl00_x5" style="font-size:XX-Small;">Hide</span>
     </div>
     <div id="ctl00_x6" style="width: 150px;">
      <div id="ctl00_x7" style="text-align: center; background-color: #5377A9; color:white; width:145px; font-weight:bold;" class="Left">
       Test Cell<br />Settings
       <div id="ctl00_x8">
        <table id="LeftTable" cellpadding="0" ...
       </div>
      </div>
     </div>
     <div id="ctl00_x9" style="width:60px;">
      <img ... 
      <span id="ctl00_x10" style="font-size:XX-Small;">Hide</span>
     </div>
     <div id="ctl00_x11" style="width: 150px;">
      <div id="ctl00_x12" style="text-align: center; background-color: #5377A9; color:white; width:145px; font-weight:bold;" class="Left">
        Test<br />Settings
       <div id="ctl00_x13">
        <table ...>
       </div>
      </div>
     </div>
    </div>
    <br />        
   </div>  
  </div> 
 </div>

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