比如以80%,90%播放!
当然以不同分辨率为前提

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if(w<835){
        document.write('<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="720" height="980">');
        document.write('<param name=movie value="logo_9-15.swf">');
        document.write('<param name="quality" value="high">');
        document.write('<embed src="logo_9-15.swf" quality=high align="middle" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="720" height="980"></embed>');
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        document.write('<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="810" height="1102">');
        document.write('<param name=movie value="logo_9-15.swf">');
        document.write('<param name="quality" value="high">');
        document.write('<embed src="logo_9-15.swf" quality=high align="middle" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="810" height="1102"></embed>');
        document.write('</object>');}
         if(w<900 & w>835){
        document.write('<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="810" height="1102">');
        document.write('<param name=movie value="logo_9-15.swf">');
        document.write('<param name="quality" value="high">');
        document.write('<embed src="logo_9-15.swf" quality=high align="middle" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="810" height="1102"></embed>');
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         if(w>=900){
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        document.write('<param name=movie value="logo_9-15.swf">');
        document.write('<param name="quality" value="high">');
        document.write('<embed src="logo_9-15.swf" quality=high align="middle" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="900" height="1225"></embed>');
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这一成功了！