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Javascript progress window while page is loading

How does one check the progress of the file loading?

User clicks link on web page to open Excel file in a new browser window.
File sizes can be 2MB + . Over a crappy connection they could take 10-20 seconds to load.

Looking to do...
Pop another window (gets focus) that has a static image that says something like "Loading....This could take up to a minute."
Once the Excel file is loaded into the new window, signal the popup window to close.
1 Solution
I'm not sure there is a way to know the progress of the download of an excel or pdf(in my case) before it shows in the browser.
What i've done once was
- user click on the link
- page saying "loading ..." opens that has a script on onload="location.href='thefile.xls'"

I actually changed the "loading..." text with a flash animation showing the typical movie countdown.

All that to show the user something was happening ...
once the file finishes to download, it loads normally in the browser in place of the loading text.
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