Are you running Win XP?
If yes, DL this and install it: http://download.microsoft.com/downlo...ertoySetup.exe
Then once it's installed, select all the images you want to resize and right click on the selections. You will see a menu option "Resize Pictures/Images"
Select no larger then 1024x768 and ok.. It will create copies of the images that are resized. Upload to whatever host you like and post just like before.
If you have Vista/W7 then use this clone of the tool: http://imageresizer.codeplex.com/