How to embed moving ads on the sides of webpage(forums)

I intend to display some ads on the sides of my website which move up and down as the user scrolls the long webpage(forum topics etc)

Firstly i am a novice who does not know what to call such containers which move. so can somebody tell me if they have any technical names ?so that i can update my query

Then the question comes to is it HTML, PHP etc.

I am not a big web programmer, but i am on a learning curve. so any suggestions, help开发者_如何学JAVA is appreciated

All you need is CSS.

Create a div which contain your ads, and add position:fixed style to the div.

For example, your html:

<div class="ad">
   ...
</div>

and the CSS

.ad{
   position:fixed
}

Edit : An example here : http://fiddle.jshell.net/tTdu3/