[Req] Correlation Data between 2 random US stocks

[FrCrilly]

Hi All,

I'm researching a stock market investment strategy in which risk management will be the top priority. I looking for a facility on the web that tells me the correlation between 2 random and seperate US stocks, ie how they have moved in tandem with each other, against each other or neither over a previous specified period of time.

Does anyone have experience of such a facility (or similar) on the web? If yes, is the data reliable and can it be obtained cheaply/freely? Are there any other pointers in relation to using it?

Any help with the above will be greatly appreciated. Thanks In Advance for all responses