<alt> tag questions

[Betka]

In an effort to get better search engine position I have enhanced my image alt tags. In IE the alt tags are appearing as tooltips over the image. What I have on the alt tags is sometimes conflicting with the captions. I would like to stop the alt tags from displaying as tooltips. Is there any way to do this? This is the page which may make my question clearer.
http:www.highmountainfarms.com

Betka

[Fang]

IE incorrectly displays the alt value, which is used when the image is not available or spoken by screen readers.
Adding an empty title attribute value would prevent IE from displaying the alt value.