How to put flash content over the html even if the flash is not

So, if you go to MySpace for example (http://www.myspace.com/sonidolalimpia) you see now the logo have a very interesting effect when you p开发者_运维知识库ut your mouse over, how they did this?

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As already was written, all trick not in the flash, but in the css and jQuery. They uses jQuery onMouseOver Event and simply switch the picture version of the logo with a transparent flash one.

before

<h2>    
    <a href="/" class="MSIcon MSLogo" id="msStaticLogo" style="left: 0pt;">
        Myspace
    </a>
</h2>   

<div id="flashLogoContainer">
    <a href="/">
    <span id="logoInTrigger">   
    Myspace 
    </span>
    </a>
    <object width="354" height="475" type="application/x-shockwave-flash"
            data="http://cms.myspacecdn.com/cms/x/11/3/bag.swf" id="msFlashLogos" 
        style="visibility: visible; top: -28px; left: -9999px;">
    <param name="quality" value="high">
    <param name="wmode" value="transparent">
    <param name="bgcolor" value="transparent">
    <param name="allowscriptaccess" value="always">
    </object>
    <span class="MSIcon beta" id="beta">Beta</span>
    <div id="leftLogoTrigger" style="display: none;"></div>
    <div id="rightLogoTrigger" style="display: none;"></div>    
    <div id="bottomLogoTrigger" style="display: none;"></div>   
</div>
</li>

after

 <li class="logo">
<h2>    
    <a href="/" class="MSIcon MSLogo" id="msStaticLogo" style="left: -9999px;">
        Myspace
    </a>
</h2>   

<div id="flashLogoContainer">
    <a href="/">
    <span id="logoInTrigger">   
    Myspace 
    </span>
    </a>
    <object width="354" height="475" type="application/x-shockwave-flash"
            data="http://cms.myspacecdn.com/cms/x/11/3/bag.swf" id="msFlashLogos"
        style="visibility: visible; top: -28px; left: -120px;">
    <param name="quality" value="high">
    <param name="wmode" value="transparent">
    <param name="bgcolor" value="transparent">
    <param name="allowscriptaccess" value="always">
    </object>
    <span class="MSIcon beta" id="beta">Beta</span>
    <div id="leftLogoTrigger" style="display: block;"></div>
    <div id="rightLogoTrigger" style="display: block;"></div>   
    <div id="bottomLogoTrigger" style="display: block;"></div>  
</div>
</li>