Laura's dashboard

I installed a mortgage calculator in a sidebar. I pasted the generated code in a textbox widget. All went fine until I tried to uninstall it. I deleted the textbox widget from the sidebar, I deleted the widget from my widgetbox account. Now even tho there is no trace of it, I get a flash graphic showing "no widget found" with a get widget button underneath. If I view the source of the iframe it shows body onload="WIDGETBOX.publisher.Main.setWidgetLoaded() and a link to the script.

How do I remove this thing? Where is it?