WHY KEIL DOES NOT HAVE DELAY FUNCTION LIKE TURBO C

Hello all,
1) can any one help me to write function in keil c51, like " delay(int milli sec)" like in turbo c/c++.
2) for above i want to use present project's crystal value (like variable) in user defined functions how to get that crystal value while writing code in "c".
thankyou,
PADMANABHAM

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