You can have the JQuery Intellisense following this steps:

1. Download from the JQuery site the file jquery-1.4.1-vsdoc.js, search for the Visual Studio link near the release link
2. Add the file to your project
3. Change your js file and add to the top of the file:

Reference :http://devcoma.blogspot.com/2010/08/how-to-add-jquery-intellisense-to-js.html