MG, both are actually correct....grey or gray....i looked it up once in the dictionary cuz i always spell it gray but i saw it spelled grey too.
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http://dictionary.reference.com/search?q=grey
gray1 also grey ( P ) Pronunciation Key (gr)
adj. gray?er, also grey?er gray?est, grey?est
Of or relating to an achromatic color of any lightness between the extremes of black and white.
Dull or dark: a gray, rainy afternoon.
Lacking in cheer; gloomy: a gray mood.
Having gray hair; hoary.
Old or venerable.
Intermediate in character or position, as with regard to a subjective matter: the gray area between their differing opinions on the film's morality.
n.
An achromatic color of any lightness between the extremes of black and white.
An object or animal of the color gray.
often Gray
A member of the Confederate Army in the Civil War.
The Confederate Army.
v. grayed, also greyed gray?ing, grey?ing grays, greys
v. tr.