I got the solution from your reference link.

This method is old and outdated. Please do not use it. Refer to a tutorial that deals with the modern version of the script. IE- http://nooshu.com/swfobject-2-2-and-wmode-transparent/

var params1 = {movie:”Flash/SlideShowPlayer.swf?xml_path=Flash/SlideShowDetails.aspx?FromPage=MyPage&Dat=”+ Date.parse(new Date()),quality:”high”, wmode: “transparent”, allowscriptaccess: “always”, defer: “defer”};
swfobject.embedSWF(“Flash/SlideShowPlayer.swf?xml_path=Flash/SlideShowDetails.aspx?FromPage=MyPage&Dat=”+ Date.parse(new Date()), “divSlideShow”, “485px”, “420px”, “7.0.0″, “assets/expressInstall.swf”,”",params1,”");

The “SlideshowDetails.aspx” page dynamically generates the xml input. It doesn’t work after update anything

After my dropdown menu are behide swfOblect. Then I add this code

so.addParam(“wmode”, “transparent”);

in

var so = new SWFObject(‘slideshow.swf’,'mpl’,’310′,’310′,’8′);
so.addParam(‘allowscriptaccess’,'always’);
so.addParam(‘allowfullscreen’,'true’);
so.addVariable(‘height’,’310′);
so.addVariable(‘width’,’310′);
so.addParam(“wmode”, “transparent”);
so.write(‘player’);

After It’s work.