Add reference to javascript file

You can add reference to another javascript file inside another javascript file for adding intellisense for other javascript files in Visual studio

You can do so  using the following syntax:

/// <reference path="AnotherJSFile.js" />

 and to Add Microsoft Ajax reference to javascript file:

/// <reference name="MicrosoftAjax.debug.js" />

And for JQuery there a simple way in Visual studio:

http://weblogs.asp.net/scottgu/archive/2008/11/21/jquery-intellisense-in-vs-2008.aspx