How to add content to HTMLEditor on load

I have an HTMLEditor control on a web form. (ID=Editor1) I need to add text from an asp textbox (ID=Textbox1) when the editor loads. I then need to paste the edited text back to Textbox1. For some reason this seems to be harder than it should be. Any help would be appreciated.
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This all comes down the the HTML Editor you are using. Most have javascript that you can invoke that are something like:

myEditorObj.Text = document.getElementById('<%= Textbox1.ClientID %>').val
document.getElementById('<%= Textbox1.ClientID %>').val = myEditorObj.FormattedText

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It helped me find what I needed.
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