Код:
<script type="javascript">
flash = false;
if (navigator.userAgent.indexOf('MSIE') == -1)
{
if (navigator.plugins["Shockwave Flash"]) flash = true;
else flash = false;
}
else
{
try
{
obj = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
flash = true;
}
catch(e)
{
flash = false;
}
}
if (flash) document.write('<object ...>...</object>');
else document.write('<img ...>');
</script>