[NTG-context] Persian translation of "Context an excursion"

Hi everyone, I am translating "Context an excursion" to persian and I have a problem in the style. I use MKIV for this translation but navigation tools and metapost pictures are not displayed in the output. I use texlivetest2008 and the latest luatex and mpost from www.luatex.org (but I don't know how to install pascal metapost and maybe that is the problem). Please take a look at www.omidali.com/excursion.rar I have included the fonts that I have used. I run the following command texexec --lua --mode=screen ma.cb Thanks