Calling a script on a page from the WebBrowser control.

Hi,

I am trying to call a script on a page from the WebBrowser control called "MapResize." I am lead to believe that the following should work:

Private Sub WebBrowser1_Resize(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles WebBrowser1.Resize

Me.WebBrowser1.Document.InvokeScript("MapResize")

End Sub

But I get this error: Object reference not set to an instance of an object.

What am I doing wrong

Cheers,

Scott.