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Dim a1 As IHTMLDocument2 = Webbrowser1.Document.Window.Document.DomDocument
a1.parentWindow.execScript("function alert(str){}", "javascript")
Dim a2 As IHTMLDocument2 = Webbrowser1.Document.Window.Frames(0).Document.DomDocument
a2.parentWindow.execScript("function alert(str){}", "javascript")
Dim a3 As IHTMLDocument2 = Webbrowser1.Document.Window.Frames(0).Frames(0).Document.DomDocument
a3.parentWindow.execScript("function alert(str){}", "javascript")