Here is some further information about why one should use the sRGB colour profile for images intended to be displayed on the Web. This is excerpted from a longer document on Wikipedia:
Due to the standardization of sRGB on the Internet, on computers, and on printers, many low- to medium-end consumer digital cameras and scanners use sRGB as the default (or only available) working color space. As the sRGB gamut meets or exceeds the gamut of a low-end inkjet printer, an sRGB image is often regarded as satisfactory for home use. However, consumer-level CCDs are typically uncalibrated, meaning that even though the image is being labeled as sRGB, one can’t conclude that the image is color-accurate sRGB. [underlining emphasis added]
If the color space of an image is unknown and it is an 8- to 16-bit image format, assuming it is in the sRGB color space is a safe choice. This allows a program to identify a color space for all images, which may be much easier and more reliable than trying to track the “unknown” color space. An ICC profile may be used; the ICC distributes three such profiles: a profile conforming to version 4 of the ICC specification, which they recommend, and two profiles conforming to version 2, which is still commonly used.
Images intended for professional printing via a fully color-managed workflow, e.g. prepress output, sometimes use another color space such as Adobe RGB (1998), which allows for a wider gamut. If such images are to be used on the Internet they may be converted to sRGB using color management tools that are usually included with software that works in these other color spaces.
Note the last paragraph. If your final intention is to have your image printed, then your entire workflow should use Adobe RGB – i.e. Camera Raw output has embedded Adobe RGB profile and that profile is preserved by your editing software throughout your workflow (e.g. Lightroom, Photoshop, Elements etc.). Because the Adobe RGB colour space is larger than sRGB, if you also output a jpg for Web use, you won’t have lost anything noticeable (since most calibrated monitors are limited to sRGB)