Here is an easy way to do it plus I also found a way to do it online aswell which I will add link to after this quote from the Member Gallery thread:
Originally posted by Sherrie
Don't worry it is dead easy to resize pictures just download this freeware program: IrFan View
What I did was went to image then resize/resample and bammo. Converts just about everything, I reccomend converting all pics to JPG!
Really good program!
An online method for resizing pictures: