// Adapted from: http://support.adobe.com/devsup/devsup.nsf/docs/52970.htm

function detectPDF()
{
    if (window.ActiveXObject)
    {
        var bControlInstalled = false;

        // Detect Acrobat Version 7+
        try
        {
            if (new ActiveXObject("AcroPDF.PDF.1"))
            {
                bControlInstalled = true;
            }
        }
        catch (e) { }

        // Detect Acrobat version <= 6
        if (!bControlInstalled)
        {
            for (x = 1; x < 10; x++)
            {
                try
                {
                    if (eval("new ActiveXObject('PDF.PdfCtrl." + x + "');"))
                    {
                        bControlInstalled = true;
                        break;
                    }
                }
                catch (e) { }
            }
        }
    }
    else
    {
        bControlInstalled = detectPlugin('Adobe', 'Acrobat');
    }

    return bControlInstalled;
}

function detectPlugin() {
	// allow for multiple checks in a single pass
	var daPlugins = detectPlugin.arguments;
	// consider pluginFound to be false until proven true
	var pluginFound = false;
	// if plugins array is there and not fake
	if (navigator.plugins && navigator.plugins.length > 0) {
		var pluginsArrayLength = navigator.plugins.length;
		// for each plugin...
		for (pluginsArrayCounter=0; pluginsArrayCounter < pluginsArrayLength; pluginsArrayCounter++ ) {
			// loop through all desired names and check each against the current plugin name
			var numFound = 0;
			for(namesCounter=0; namesCounter < daPlugins.length; namesCounter++) {
				// if desired plugin name is found in either plugin name or description
				if( (navigator.plugins[pluginsArrayCounter].name.indexOf(daPlugins[namesCounter]) >= 0) || 
					(navigator.plugins[pluginsArrayCounter].description.indexOf(daPlugins[namesCounter]) >= 0) ) {
					// this name was found
					numFound++;
				}   
			}
			// now that we have checked all the required names against this one plugin,
			// if the number we found matches the total number provided then we were successful
			if(numFound == daPlugins.length) {
				pluginFound = true;
				// if we've found the plugin, we can stop looking through at the rest of the plugins
				break;
			}
		}
	}
	return pluginFound;
} // detectPlugin