That's /ma.'ʒaq.sa/. "J" can also be pronounced as /dʒ/ or simply /j/. The "q" is similar to a "k" but instead of doing it by hitting your tongue to the soft palate (back of the roof of your mouth), you hit it on the uvula instead (further in the back). You can put a finger in there to feel the difference and figure out if you're doing it right, too. If you have no clue what the phonetic transcription symbols mean or can't get the sound done, just search for "IPA" on Wikipedia and then read "letters" and check it out. There's audio for most of if. Enjoy!