How can I tell if a girl likes me?

I think this girl likes me and we have been talking a lot on msn , and stuff, and I think I like her, but how can I tell if she likes me?
please help

Show her this pic. It'll be a great icebreaker. Dont tell her you're a sens fan or it'll all be over but the crying...

ask

Well sometimes people catch me out if I like them cause I do aloott of flirtin! buh sometime I dont relise ! well wa im trying to say is if shes flirtin way you den you hve a chance if she dosnt den shes playin hard to get

she will tell you if she likes u !