//If this browser understands the mimeTypes property and recognizes the MIME Type "application/x-shockwave-flash"...
if (navigator.mimeTypes && navigator.mimeTypes["application/x-shockwave-flash"]){
//...write out the following tag into the document.
document.write("");
}
//Otherwise,...
else {
//...write out the following tag into the document.
document.write("
");
}