I have a website for my artwork. I want to have a simple image swap when the user clicks on a thumbnail image. It works fine when I use 'onmouseover', however, I want to have the user click on the image, instead of holding the mouse over it.

When I use 'onmouseup' it also works, but it zooms back up to the top of the page each time the user clicks on an image. Just wondering if there is a way to prevent this.

You can see my website here www.schmidt-gallery.com/3d_design/3d_design.html

Right now it is using 'onmouseover' but if you scroll down a bit, and clicko on a thumbnail, you will get the same effect, where it zooms up to the top of the page.