document.write(escape("My phone # is 123-456-7890"));

should yield the following encoding:

My%20phone%20%23%20is%20123-456-7890

The function unescape() converts an ISO Latin-1 representation back to a normal string.

Learn how Internet Explorer does it in version 5.5 in Column 59, IE 5.5: Formatting, URIs, and Stack Operations.

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