得用js

<div class="qd_video">

<!--<embed src=' allowFullScreen='true' quality='high' width='100%' height='430' align='middle' allowScriptAccess='always' type='application/x-shockwave-flash'></embed>-->

<iframe width=100% height="100%" src=' frameborder=0 'allowfullscreen'></iframe>

</div>

</div>

<script>

window.onload=function(){

$(".mbody iframe").css({width:"90%",height:"auto"});

var _src=$(".mbody iframe").attr("src").split("&")[0].replace("preview","player").replace("https","http");

$(".mbody iframe").attr("src",_src);

}

</script>