Visual Studio 2008 provides good IntelliSense hints for JavaScript, and as the popular jquery and Microsoft will ship jquery to Visual Studio, Jquery.com publishes a visual The smart-sensing hint documentation for Studio 2008. You can download it in http://docs.jquery.com/Downloading_jQuery#Download_jQuery or get it directly from Http://code.jquery.com/jquery-1.2.6-vsdoc.js.
Add jquery js files and vsdoc.js files to the script references on the page. One thing to note is that because Vsdoc.js is an executable script, but this vsdoc file does not need render, so you need to use a server side if statement, so you can prevent the execution of JS files, but also to load the code.
<script type="text/javascript" src="scripts/jquery-1.2.6.js"></script>
<% if (false)
{ %>
<script type="text/javascript" src="scripts/jquery- 1.2.6-vsdoc.js"></script>
<% } %>
Now you can take advantage of the Itellisense feature by adding the script block and typing the jquery code: