try this then…
dlg = UI::WebDialog.new("Show location", true, "ShowSketchupDotCom", 739, 641, 150, 70, true)
result = UI.inputbox(["Address"])
if result[0] != ""
reply = "http://www.google.com/maps/search/" + result[0].gsub(/\s/, '+')
end
dlg.set_url(reply)
dlg.show