This is an example of the floating Flash menu generated by 123 Flash Menu.

The Flash menu will always float to the predefined position even if the page scrolls down.

Drag the scrollbar of the browser and see how the Flash menu floating.
 

The Flash HTML code looks like this (please dont' forget to add flashobject.js and flashfloat.js to the related folder):  

<div id="menu" > This text is replaced by the Flash movie. </div>
<script type="text/javascript">
var fo = new FlashObject("float.swf", "floater", "460", "300", "6", "#FFFFFF");
fo.addParam("menu","false");
fo.addParam("quality","best");
fo.addParam("salign","LT");
fo.addParam("scale","noscale");
fo.addParam("wmode", "transparent");
fo.write("menu");
if (navigator.appName.indexOf("Microsoft") != -1) {
   // MSIE4+
   document.floater.style.position="absolute";
   document.floater.style.zIndex="10";
   document.floater.style.left="130px";
   document.floater.style.top="100px";
}else{
   // NN4+&Others
   document.getElementById('floater').style.position="absolute";
   document.getElementById('floater').style.zIndex="10";
   document.getElementById('floater').style.top="80px";
   document.getElementById('floater').style.left="100px";
}
</script>