Very simple metaquotes request

Hi,

I'm having trouble trying to create an indicator. So I would apprecieate some help with a few things.

I want to convert the following to something that can be use by metaquotes:

lo = LOWEST

where p is a variable
extern int p =15;

so it would need to calculate the lowest of the last 15 bars.

it seems pretty easy, but i don't fully understand the langauge, so if anyone can supply the code, it will be much appreciated !

This should give you some ideas.

datetime dtTimeBegin;
datetime dtTimeEnd;

int iBarBegin = iBarShift(NULL, 0, dtTimeBegin);
int iBarEnd = iBarShift(NULL, 0, dtTimeEnd);

double dPriceHigh = High[Highest(NULL, 0, MODE_HIGH, (iBarBegin)-iBarEnd, iBarEnd)];
double dPriceLow = Low [Lowest (NULL, 0, MODE_LOW , (iBarBegin)-iBarEnd, iBarEnd)];