Manipulate/Change/Form Fill data in webpages using the Webbrowser control

[knds]

Hi,
I am a newbie on VB, using VS2005.
How do I use InvokeMember if the button does not have a name?

html - <input id="uploadButton" type="submit" value="Upload Video">

code - wb.Document.Forms("uploadVideoFileForm").InvokeMember("submit") - nothing happens
wb.Document.Forms("uploadVideoFileForm").InvokeMember(????)


what do i do? or is there a basic way to go around with this.
Thanks in Advance!