I have a website here: http://www.christmascountdown.org how do I export the graphics on my site to edit them using photoshop and what format should the graphics be in when editing and then when uploading to the site? thanks.
JJ is correct. If you can upload to the site, then you can see what files are used in that site. The same program can be used to download the images if they are not already on your computer.
I recommend in the future, keep all files for your website on your computer in a dedicated folder. If necessary compress that folder for archiving. Especially if it takes up a lot of room. If your site is small then don't worry about compressing.
If someone else is maintaining your site, you can have them email you the image.
Simply due to the fact, that the original file can be larger than what is displayed in a browser. You always want to edit from the largest image file as possible.