Version 6. Alternatively, anyone with a little time on their hands who wants to have a go themselves is welcome to...
OK this is the way to do it in Elements 5, I'm fairly sure the same should apply in 6.
Step 1:
Open the photo that you want to apply depth-of-field affect to.
press Control-J to duplicate the background layer to create a new layer that will be named "layer 1"
Step 2:
Go under the filter menu, and under Blur choose Gaussian Blur, when the dialog box appears change the radius to about 5 pixels (this can vary depending how much Blur you want, just play about with it, but remember to much will make it look to unnatural and obvious) then click ok to put a Blur over the entire image.
Step 3
Press the E-key to switch to the eraser tool (or just click on the eraser tool from the tools on the left column) then choose a large soft edged brush from the brush picker (which is found by clicking the brush thumbnail in the options bar) now start erasing over the parts of the image that appear in the foreground (or what you want to make look sharp) erasing on this blurred layer reveals the original unblurred layer image on the background layer, so by leaving these areas sharp and the background areas blurry, it creates a simple depth-of-field effect which can look like it was done with the camera.
Step 4
Go to the top toolbar and select layer, then down the bottom of the drop down menu select flatten image and then save.
On a side note just a word of warning though, make sure you have it how you want before you flatten the image and save, as once the image has been flattened you can't go back on it, so you would have to start all over again, i hope this has helped