www.imagesplitter.net: Online image splitting

Was searching today for a tool to split an image in many parts, for some web design idea. I know, that is something Photoshop or the Gimp do in a whim. I don't have these programs because my netbook is not powerful enough and its screen to small. I use paint.net and haven't yet figured out how to write macros/scripts or download a plugin for "splitting a photo into many equal parts" (hence my search string). What I found is www.imagesplitter.net that does this exact job well, along with resizing, cropping, and conversion.