if(Silverlight.isInstalled("1.0"))

                                               {

                                                   createDesafiaSilverlight();

                                               }

                                               else

            {

                document.write("<a href='http://www.microsoft.com/Silverlight/Install.aspx'>");

                document.write("<img src='/spain/responsabilidad_corporativa/images/ErrorNoSLhome.gif' border='0'>");   
            }