When a mouse goes over an image, usually it stays for only few seconds. I'd like one that can stay for as long as the mouse is over it. And that the description/comment that appears can have a background color.
The alt attribute displays alternate text when the image can't be displayed.
It is the title attribute that pops up text when you mover the mouse over whatever part of the web page that has the attribute attached (including images and any other part of the page).
Internet Explorer has a bug where it incorrectly displays the alt text when you move the mouse over an image that doesn't have title text attached. Other browsers only display title text when you hover over images (or any other part of the page).