using the class instruction Options

[gsd12345]

I am trying to postion diffent images in variou pisitionson my page (e.g a banner, an image part of the way down the page, and another image further down fom that). I believe I need to use 'class' on the page in order to do this. Can someone put on hre a brief of example of tis being used as I'm not quite sur how to name the class with an image (is it class="img name") or what bit to put in the head and what goes in the body in relation to the attrbutes I want to put in for each image.
Thanks for any help.

[pandy]

See here.
http://htmlhelp.com/reference/css/quick-tutorial.html
http://htmlhelp.com/reference/css/structure.html
http://htmlhelp.com/reference/css/style-html.html