It is from an external js file and it is the only file linked to the page.
OK.
When I double click this file I get the following error
Sounds like you’re double-clicking/running a .js file, which will attempt to run the script outside the browser, like a command line script. And that would explain this error:
Windows Script Host Error: 'window' is not defined Code: 800A1391
… not an error you’ll see in a browser. And of course, the browser is what supplies the window object.
ADDENDUM: As a course of action, I’d suggest opening the relevant HTML file and taking a peek at the console. If you don’t see anything there, it’s likely your window.onload definition is simply being hit after the browser fires the window.onload event.
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