Photoshop Elements 4 question

[Dan Mitchell <danmdan@xxxxxxxxxxxxxx>]

(Question to the List)

In an attempt to produce a small enough photo. for the site I reduced  
one proposed submission to "81.34K" as shown to be the size just  
before saving as a jpg.  However after saving the submission I used my  
Apple Mac's "Get Info" facility - only for it to show the picture as  
being "148K on disk"

Who is telling the truth, and why the difference ?

Dan.