Remember that reassuring line “I’m on your side” from the Simon & Garfunkel song, “Bridge Over Troubled Water”? Wouldn’t it be nice to have someone on your side at work — someone who would be willing and eager to offer you professional advice — a mentor? Some potential sources of mentors: Professional organizations devoted to a particular field. Find them by surfing the Web and asking colleagues and supervisors for leads. Once you find relevant organizations, search their Web sites for potential mentors and training opportunities. And if possible, participate in these organizations’ events. Even better, contribute to events in order…