You can collect the information and format it to your hearts' desire, but you cannot save a file using JS only.
You need a server side language to accomplish this task.
"Say there are two text boxes on a web page. Is there a way to add a button to your browser to save those specific strings to a predetermined csv file?"
and than post them as mail attachments to your account? or what?!
a little known fact is that a simple html page saved as page.xls will open just fine in excel.
for IE users, you set doucment.body.innerHTML to a table, and trigger the "saveas" document.execCommand using IE-only syntax.
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