Thumbnail image link to Full-sized image

hi,

I have got two images of different size.
And I want small size image linked to large size image.

So how can I create a thumbnail image that is linked to the full-sized image?

A thumbnail image is just a copy of the full-sized image that has been modified to reduce the size of the file.

It is linked to the full-sized image with a normal link:

<a href="full-sized.gif"><img src="thumbnail.gif" alt=... /></a>