how can I display tooltip or item information on mouse over?
Solution 1:
Use the title attribute while alt is important for SEO stuff.
Solution 2:
The simplest way to get tooltips in most browsers is to set some text in the title attribute.
eg.
<img src="myimage.jpg" alt="a cat" title="My cat sat on a table" />
produces (hover your mouse over the image):
a cat http://www.imagechicken.com/uploads/1275939952008633500.jpg
Title attributes can be applied to most HTML elements.
Solution 3:
The title attribute works on most HTML tags and is widely supported by modern browsers.