html - img not showing up inside div -

here's code

               <div class="table">                     <div class="tr">                         <div class="td">                             <h1 class="logo-fill">                                 <a href="#" title="logo">                                     <img alt="logo" src="./images/logo.png" />                                 </a>                             </h1>                         </div>                         <div class="td">                             <a href="#" title="adspace">                                 <img alt="adspace" src="./images/adspace.png" />                             </a>                         </div>                     </div>                 </div> 

for reason, second image (adspace.png) not displaying @ all. if remove entire img tag , replace text, text displayed. alternativly if change img tag to:

<iframe src="https://clients.ragezone.com/out.php/display/show_custom?id=48" scrolling="no" style="padding: 0px; overflow: hidden;" width="468px" height="60px" frameborder="no"></iframe> 

apparently works well. adspace.png 468px x 60px green box.

my money on fact have adblocker in browser. try changing class names , img name. adblocker plugins search keywords in code , block page elements based on that.