problems with testing

when testing my website on other computers the background i had imported did not show up. the reason for this was that i had exported the slices from photoshop as .jpegs that were saved for the web. however when i imported these into dreamweaver i assumed that when importing an image, that dreamwever copies it to the site rootfolder. however this didn't happen so i instead i had to not save the background for web but just import the .jpeg which worked fine once they were copied into the images folder.