Retain Intellisense For Javascript Global Variable In Visual Studio 2008?

I have a JavaScript wrapper that I initialize on body load and set to a global variable.

Just after creating the object, I have full intellisense, but when referring to it later, from another function, the intellisense is lost. I presume this is because of dynamic typing:

var myWrapper;
function onload() {
myWrapper = new Wrapper(args);
myWrapper. //intellisense here.
}
function whatever() {
myWrapper. //intellisense lost.
}

I get round this by pretending to create the object again before my code, and then deleting the line:

function whatever() {
myWrapper = new Wrapper(); //pretend to create object again.
myWrapper. //intellisense returns!
}

Has the inference been improved in vs 2010, or is there any way to tell Javascript about the type of object I'm currently working on?