The difference is in how each browser impliments the alt. In IE it shows up like a "tooltip" over the image when you hover over it. BUT in any Netscape-esque browser it will only show up if images are turned off, or if the image doesn't acutally exist on the server or if there is an error. It also will work if someone is surfing your page with software that reads the page to them. Your alt tag will be read as a description in lieu of the user actually seeing the image.
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