.dmg keeps opening in Disk Utility

When I try to open a .dmg file by double clicking it it mounts it as a disk image on Disk Utility and from there I have to right click and select "Open Disk Image". This has only started happening since I've upgraded to OS Lion.
Any ideas?
Cheers

Sounds like there has been a disconnect between .dmg files and the application that mounts them, DiskImageMounter.
Select any .dmg file. Press COMMAND-I to open the Get Info window. In the Open With section select DiskImageMounter from the dropdown menu then click on the Change All button. If the application isn't listed then locate it in the /System/Library/CoreServices/ folder.

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