That was what Josep M. (a Catalan user) said in the first Catalan-Valencian discussion (http://shoutbox.menthix.net/showthread.php?tid=10716&page=1).
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Ask to any linguist...
Also you can search in Encyclopedia Britannica
http://www.britannica.com/eb/article?eu=118108 or the Columbia Enciclopedia
http://www.bartleby.com/65/in/IndEurTABLE.html
On this page:
http://www.laurentia.com/iso639/lang-en.htm you can see the the ISO 639 Languages and Dialects table, and this one about the Romance Languages:
http://www.orbilat.com/General_Survey/Romance_Languages.html
Finally and definitive, you can go to the University of València and see that they designate his language "catalan"
http://www.uv.es/uvalen/cat/
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These webs demonstrate that Valencian is not a language, but it's still in MsgPlus. Patchou, please, tell me why.
Comencem dividint les llengües, i acabem dividits com a poble.