Picture Help Please

I want to have a thumbnail of a image on my site, and when you click it you can see the full size image, only needs to be basic.

Anyone know how to do it simply? Or is there a simple tool one can use in dreamweaver?

Thanks

umm i think theres a script called phpThumb
www.google.com/search?q=phpThumB

Highslide (http://vikjavev.no/highslide/)

Highslide (http://vikjavev.no/highslide/)

That looks really good, I will have a look tonight.

Thanks