function PackageImages()
{
    var ddlPackage;
    var imgPackage;
    
    this.Initialize = function(_ddlPackage, _imgPackage)
    {
        ddlPackage = document.getElementById(_ddlPackage);
        imgPackage = document.getElementById(_imgPackage);
        
        this.Update(ddlPackage);
    }
    
    this.Update = function(source)
    {
        var selectedValue = source.options[source.selectedIndex].value;
        if (selectedValue == "")
            selectedValue = "none";
        var img = PackageImageMap[selectedValue];
        imgPackage.src = "Resources/PackageImages/" + img;
    }
}

var PackageImages = new PackageImages();