regarding tabs in html

while movin the 开发者_开发知识库mouse near the parent tab it should show the all menus under that tab how can we do this in html

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You can't do this in HTML. You must use for it JavaScript and CSS (eg. jQuery or other AJAX library is good for it).

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Nested lists, ie the <ul> and <li> tags, together with css :hover properties should be able to achieve this, but experience tells me to use one of the many easier options out there, with a dash of JS.

A good start is the suckerfish family - this gives you an idea of where to start, and is cross browser, and then move on to son of suckerfish.

There are many many ways to do this, but I've found these the simplest and most adaptable.