var ua = navigator.userAgent.toLowerCase();
var isIE = (ua.indexOf("msie") != -1); 
var quicktimeinstalled = 0;
var flashinstalled = 0;

//Для всех, кроме IE
for (i = 0; i < navigator.plugins.length; i++)
	if (navigator.plugins[i].name.indexOf('QuickTime') > -1)
		quicktimeinstalled = 1;
	else if (navigator.plugins[i].name.indexOf('Flash') > -1)
		flashinstalled = 1;

//Для IE
if(isIE)
{
	try
	{
		if(!quicktimeinstalled)
			if(eval('new ActiveXObject("Quicktime.Quicktime")'))
				quicktimeinstalled = 1;
	}
	catch(e) {}

	try
	{
		if(!flashinstalled)
			if(eval('new ActiveXObject("ShockwaveFlash.ShockwaveFlash")'))
				flashinstalled = 1;
	}
	catch(e) {}
}

if(!flashinstalled)
	$("#check_flash").attr("value", "off");

if(!quicktimeinstalled)
	$("#check_quicktime").attr("value", "off");

if(!flashinstalled && !quicktimeinstalled && isIE)
	$("#check_activex").attr("value", "off");