var minFlashVersion = 5;
var nPlugin = navigator.plugins;
var hasFlash = false;

if (!document.all)
{
    for (var i = 0; i <= nPlugin.length && !hasFlash; i++)
    {
        hasFlash = navigator.plugins[i].description.indexOf("Flash") >= 0;
    }
}
else
{
    if (flash5 || flash6 || flash7)
    {
        hasFlash = true;
    }
}