It depends on their size of the image hun, if their any smaller (width or height) than 500 pixels, then there really isnt much you can do to as theres not enough data to fill in the extra detail. if you wanna give it a go anyway, you could use either 'Photoshop' or 'Paintshop Pro' and use their anti-alaising filter's to remove blockyness, though make sure to enlarge the images first lol.
note, check the file extension, if your working with a "JPEG/JPG" file, you may loose quality anyway just by editing it, as its a lossy image format, and applies anti-alaising effects everytime you save anyway to remove details that maynot be desired.
Aimee.
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