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str+=' codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="523" height="390"> ';
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str+='  <param name="quality" value="high"> ';
str+=' <embed src="img/main.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer"  ';
str+='    type="application/x-shockwave-flash" width="523" height="390"></embed> ';
str+='  </object> ';

document.write(str);