if (!window.Silverlight)
{
    window.Silverlight = { };
}

Silverlight.isInstalled = function(version)
{
    var isVersionSupported=false;
    var container = null;
    
    try 
    {
        var control = null;
        
        try
        {
            control = new ActiveXObject('AgControl.AgControl');
            if ( version == null )
            {
                isVersionSupported = true;
            }
            else if ( control.IsVersionSupported(version) )
            {
                isVersionSupported = true;
            }
            control = null;
        }
        catch (e)
        {
            var plugin = navigator.plugins["Silverlight Plug-In"] ;
            if ( plugin )
            {
                if ( version === null )
                {
                    isVersionSupported = true;
                }
                else
                {
                    var actualVer = plugin.description;
                    if ( actualVer === "1.0.30226.2")
                        actualVer = "2.0.30226.2";
                    var actualVerArray =actualVer.split(".");
                    while ( actualVerArray.length > 3)
                    {
                        actualVerArray.pop();
                    }
                    while ( actualVerArray.length < 4)
                    {
                        actualVerArray.push(0);
                    }
                    var reqVerArray = version.split(".");
                    while ( reqVerArray.length > 4)
                    {
                        reqVerArray.pop();
                    }
                    
                    var requiredVersionPart ;
                    var actualVersionPart
                    var index = 0;
                    
                    
                    do
                    {
                        requiredVersionPart = parseInt(reqVerArray[index]);
                        actualVersionPart = parseInt(actualVerArray[index]);
                        index++;
                    }
                    while (index < reqVerArray.length && requiredVersionPart === actualVersionPart);
                    
                    if ( requiredVersionPart <= actualVersionPart && !isNaN(requiredVersionPart) )
                    {
                        isVersionSupported = true;
                    }
                }
            }
        }
    }
    catch (e) 
    {
        isVersionSupported = false;
    }
    if (container) 
    {
        document.body.removeChild(container);
    }
    
    return isVersionSupported;
}