I looked in the Object Browser for the functions of the Webbrowser Control, sadly but true, there is no way to disable picture downloading from the Webbrowser Control. All you could do is probably find out the status from the WebBrowser1_ProgressChange property.

You can do something like:

Code:
Private Sub WebBrowser1_ProgressChange(ByVal Progress As Long, ByVal ProgressMax As Long)
x = Progress
If Instr(x, "500") Then
Webbrowser1.Stop
End If
End Sub