progressive jpeg non correspondance

hello. Im back again because soem images i downloaded, work fine on my comp but when they are on moonshell on my r4, it says load error.
I held start and it says, blah blah
blah
progressive jpeg non corresponance.
Can someone give me a clue as to why.
Some images i DL work. But its occasionally it doesnt.

Maybe the resolation is too high.Convert to something that fits the ds screen.

do you know how i can shrink multiple files at once.
And what i can use to do this

Try using IrfanView.http://www.irfanview.net/use this guide for getting it donehttp://mecrunchy.blogspot.com/2008/04/guide-to-resizing-multiple-images-with.html

Go for 256x192 pixels.