How to make nice grahics for a flash website?

Everytime when i go to a flash website, they all have a nice looking, their grahics are very nice (like 3D grapics ). Are they using Photoshop that kind of program to make the grahic or i can just use flash? If the graphics are are made by photoshop, how can i put the graphics into/ work with flash ???
(example of flash website with nice grahic: http://www.clubsaffire.com/ , [url=“http://layouts.drawingart.org/”]http://layouts.drawingart.org/ , [url=“http://www.kranestyle.com/”]http://www.kranestyle.com/ , [url=“http://www.flashlevel.net/”]http://www.flashlevel.net/ )

Can anyone help me, plz… ?
Thank you

Ryan:pleased: