function flash(secure) {
    var shockmode = false;
    var mimetype = 'application/x-shockwave-flash';

    if (navigator.mimeTypes) {
        if (navigator.mimeTypes[mimetype] != null) {
            if (navigator.mimeTypes[mimetype].enabledPlugin != null) {
                shockmode = true;
            }
        }
    }

    if (!shockmode && navigator.appVersion.indexOf('MSIE') != -1) {
        shockmode = true;
    }
    if (shockmode) {
			document.write('<OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" ID="uvodni" width="841" height="266">');
			document.write('<PARAM name=movie value=animace/animace.swf>');
			document.write('<PARAM NAME=menu VALUE=false>');
			document.write('<PARAM name=quality value=high>');
			document.write('<PARAM NAME=loop VALUE=true>');
			document.write('<EMBED src="animace/animace.swf" loop="true" menu="false" quality="high" width="841" height="266" type="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer"><\/EMBED>');
			document.write('<\/OBJECT>');
    }
    else {
        document.write('<IMG SRC="img/hlavicka.jpg" WIDTH="841" HEIGHT="266" BORDER="0" ALT="Potrefená husa">');
    }
}