Geocities is an abomination in so far as it's "alocated data transfer" is concerned..
Anyway, just in case you happened to be using a Wondows-friendly OS....
Go to Start/Programs/Accessories/Paint and open up your pictures...
Then, go to the menu bar at the top...
Click on Images/ Stretch-Skew
From there, enter into the first two blank dialogue boxes, which will be under "Stretch," the number 50 (fifty)
If you put this in both of them (Or any number for that matter) it will decrease the size proportionally. Click the 'OK' button.
And you're all set!
*winks* If you're not on a Windows system...Then I dunno. LOL.
Also, instead of Geocities, you might wanna try photobucket.com it's a great pic-hosting site, and they've got great space cababilities.
Talk to you soon, cutie!