You "can" do this. Is the recipe too long to type?
I would highly recommend not scanning it in especially if it's only one recipe. Why? It will take you longer to do than you think. Because the quality will not be as good as if it were typed in. Downloading it for everyone else will take a long time if you want the quality to be good. Anyone who uses MasterCook or similar software won't be able to easily include it in their files by importing it. Personally, I don't think it's worth the hassle. (How many recipes have you come across online that are scanned in?)
If you have several recipes, I recommend an "OCR" software. This stands for "optical character recognition" like Omnipage Pro. With this, you scan the document (in your case, the recipe) and it converts the image into a text file, like you spent the time to type it in. There is a free OCR software here: http://www.expervision.com/webtr6.htm
For information on OCR products, look here: http://web3.humboldt1.com/~jiva/ocr/_ocr_resource.htm
Cape Chef, a "jpg" file is a format for an picture or "image" to be displayed on the internet by a web browser like Netscape or Explorer. There are other types or formats that an image can be such as "gif" and "tif" Some are bigger files and some are smaller. "gif" is smallest and quickest, "tif" is larger and much higher quality, often used by graphic designers to send to the printer. By larger and smaller, I am not talking 5cm by 7cm but rather 750K vs 5 Megs of disk space which affects download time.
For more info on Image Files look here: http://www.google.com/search?q=.jpg+...n&lr=&safe=off
and here: http://scv.bu.edu/SCV/Tutorials/Imag.../image101.html
If you REALLY want to do it, I might be able to help.