What's the difference between <script type="text/javascript"> and <SCRIPT LANGUAGE="javascript">

Do any one know?

Yes, there is a difference .

<script language="JavaScript"> "language" attribute has been deprecated.
The required attribute is "type" and the type="text/javascript"

Hence...

<script type="text/javascript"> is now the correct form


Because language="javascript" is deprecated does not mean that it will not work.
It means that it is outdated and should be considered as poor coding practice.

http://www.webmasterworld.com/javascript/3370312.htm