In VBA is it possible to intercept a javascript onchange event and grab the originating ID# in the webbrowser control?

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The above code is a combobox demo, If I were to select an item from the combobox, it would process onchange in javascript. What it does is pull up a form containing current date and reference number, instead I would like to pull up my own userform and then spit that data into a related (notes0) field. How would I intercept this when it occurs so I can assign it to the correct field.