Enabling intellisense for ecma script object model

I want to enable intellisense for ecmascript object model in sharepoint 2010.

Iam able to get some properties but not getting all the objects and properties.

like for below code iam only able to get till get_web() and iam not getting get_webs()

this.webs = clientContext.get_web().get_webs();

Iam following below post but not getting all the properties and objects.

http://msdn.microsoft.com/en-us/library/ff798328.aspx

Client Object Model Javascript intellisense

can anyone please help me to know.