Ширина и высота Iframe

iframe {width: 500px !important;height: 400px !important;}

<div class="videoPlayer">Здесь плеер</div>

         .videoPlayer embed,  
         .videoPlayer object,  
         .videoPlayer iframe {width: 980px !important; height:550px !important;}

<div class="videoPlayer">Здесь плеер</div>

<script>$(document).ready(function(){
$('.videoPlayer iframe').attr('width','500');
$('.videoPlayer iframe').attr('height','360');
$('.videoPlayer object').attr('width','500');
$('.videoPlayer object').attr('height','360');
$('.videoPlayer embed').attr('width','500');
$('.videoPlayer embed').attr('height','360'); 
});</script>