if you work with this person, don't get in a relationship with someone at work, it is probbably the stupidist thing anyone could do. If you ever have a bad moment, you either have to quit your job, or she could tell the boss your harrasing her and get you fired etc. And even if you do end up dating, a break up would result in a very bad job situation.
Think of it this way, would you want to spend all your time with your significant other, becuase if you see each other all the time at work and then later, you really don't have a chance to have much of anything else, depending of the girl/guy, but there are a lot who are like that for sure