Incompatibilité code html et menu de navigation

Bonjour,
Depuis que j'ai ajouté un nouveau widget sur mon site, le sous menu de navigation ne fonctionne plus.
Ci-dessous le code Html du widget en question:

Code:

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<!-- 
    WuBook Javascript Library
    Eventually, put it inside
    your <head/> tag
-->
<script src="https://wubook.net/js/wblib.jgz"></script>
<!-- 
     put the following div where WuBook 
     should be designed. Make sure to
     preserve the div contents (backlink)
-->
<div id="_wbord_">
  <a href="http://fr.wubook.net/" style="display: block; margin-top: 5px; text-decoration:none;border:none" target="_blank">
    <img src="https://wubook.net/imgs/default/booking_by_wu.gif" alt="Wubook.net" title="WuBook" style="border:none;text-decoration:none">
  </a>
</div>
<!-- 
     Initialize the WuBook Object.
     Collect params settings.
     Call WuBook.design_rwidget().
 
     Notice WuBook Object provides a
     lot of interesting features.
-->
<script>
  var WuBook= new _WuBook(1450626514);
  var wbparams= {
    bordercolor: '#dc5326',
    lang: 'en',
    buttoncolor: '#d8521b',
    failback_lang: 'en',
    wbgoogle: 1,
    bgcolor: '#ffffff',
    dcodeval: '',
    iconcolor: '#888888',
    textcolor: '#2c2c2c',
    default_nights: 2
  };
  WuBook.design_rwidget("_wbord_", wbparams);
</script>
<!-- 
    that's all :)
    Thank you for using WuBook!
-->

En vous remerciant pour votre aide,