Get price of different pair than one expert is attached to.

Does anyone know how to use an expert attached to, say, GBP/USD to get a current price for GBP/JPY? I am trying to calculate pip values for a lot sizing strategy.

Thanks,
JS
see the following functions in the dictionary

iClose(...);
iHigh(...);
iLow(...);
iOpen(...);
iVolume(...);
see the following functions in the dictionary

iClose(...);
iHigh(...);
iLow(...);
iOpen(...);
iVolume(...);


for current prices only use MarketInfo function - it does not download timeseries into expert history center
I forgot to mention that I'm working in MT3 - is this still possible? Thanks very much for your help.

JS
I forgot to mention that I'm working in MT3 - is this still possible? Thanks very much for your help.

MarketInfo function
Excellent - thanks Slawa & GT!