Ron Zisman wrote:
> http://www.musiccityyo.org/gallery.html

> i preparing a photo galley for a small site for kids. the images 
> don't have captions, but i want interested people to be able to 
> identify the images to be able to order prints from the photographer.
>  i know i could just put the image number into a caption, but would 
> rather it no be there unless needed.

Demo: <http://www.gunlaug.no/tos/alien/rz/test_08_1004.html>

First row show captions in hover.
(IE6 needs more help than I've included in the example for that one to
work, but other browsers will do fine.)
With such a hidden caption the alt-attribute on images can be left empty.

Second row has title-attributes - tootips. Title-attributes can not
replace text in alt-attributes.

Note that IE/win is buggy and presents text in alt-attributes as
tooltips by default - unless there's a non-empty title-attribute in
which case it'll present the title-text instead.

> what is a tooltip (it shows on mouseover) and would that work using 
> the title attribute on each image?

A title-attribute is where you can place short pieces of extra,
non-vital, information, and hope browsers present it on hover.
Nearly all browsers do present title-text as tooltip - after a short
delay, but _how_ browsers present tooltip is outside our (CSS) control
and the tooltip text is often hard to read.

regards
        Georg
-- 
http://www.gunlaug.no
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