Not sure how you got here, but mtgox is dead. This page only exists for those who wish to view some historical charts. If after these trades price is higher you will here “up” bitcoin charts mtgox audie, if lower, “down” sound, and if it stays the same “no change” sound.
If you set it to 0. This setting is currency specific setting. It won’t work if you switch to another currency. The chart below is the price change over time. The yellow line is the price at which actual trades were made.