How to work javascript?

Code:

Webrowser1.Document.InvokeScript("JSfunctionsName", _
                        New Object() {value(0), value(1), ...})

or if function has not parameters then just

Code:

WebBrowser1.Document.InvokeScript("JSfunctionsName")

Edit: Or do you need to add your own javascript to the page?
if so then you can invoke local javascipt:

Code:

Dim code As String = File.ReadAllText(Javascript's path here)
Webbrowser1.Document.InvokeScript("execScript", New Object() {code, "JavaScript"})