make seamless in photoshop?

hey, does anybody kno how to make a seamless texture in photoshop? ive seen people say theres a “make seamless” button in gimp, is there one in PS?

http://www.3drender.com/light/EqTutorial/tiling.htm

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besides, that method is blender. The gimp’s method can look like the image is tiled twice as much as it really is. (but it is only two clicks)