ok, I will make the language more clear and simple.
In "Upload Photo Options"
Save and display medium and large images? Yes/No
By selecting yes will allow the "members and viewers" to "view both" large and medium image (medium by default and large by clicking on the medium image)
What I want is ....
Save both both the images but show only medium image.
Like here ... http://www.photopost.com/photopost/s....php?photo=606
It shows "My xp desktop" in medium and when user click on the image it shows bigger image (in actual size)
I want the photopost to keep the original size image "but let the site users" ONLY se the medium size image and "even in the photo details don't show the size of bigger image"