well im supposing your referring to vignetting. You can add a vignette to your picture as an action within photoshop. You just have to download it from this website or you can follow the instructions:
http://brianhancockphotography.blogspot.com/2008/01/photoshop-vignette-action.html
And if you want to add a blurring edge you can;
1. open desired file in photoshop
2. open your layers panel
3. unlock and duplicate the background picture layer (the only layer when you open the untouched file)
4. select the duplicated layer
5. go to the filters menu in photoshop and scroll down to blur>guassian blur and set the blur to the desired amount of blur you wish to have on the edges of your picture.
6. Now that the duplicated layer is blured, add a layer mask to the duplicated layer
7. select this layer mask and turn it black(set your background color swatch to black then, for mac users, hold down command then press backspace.)
8. once the duplicated layer's mask is black, select the gradient tool then radial gradient on the gradient tool tool bar.(make sure the gradient is set from white>nothing.)
9. set your foreground color swatch to white
10. select the layer mask
11. then click the center of the picture with the gradient tool set on radial gradient and drag outward to preferred distance.(how far you drag the line determines how large the gradients diameter is.)
12. The picture SHOULD be focused in the center and blurred around the edge.
if this doesnt work ask me what the problem is.