There is too much text for the "speech balloon" that pops up on the ones I tried and looks to be starting too far down it as well (FF 3.6.17) Also as you can see from the screenshot, the text for some images isn't going to fit without a rethink on the formatting.

For those having trouble right clicking, it seems that once the balloon appears, there is just room above and left to right click for the context menu, though I'd suggest that using middle click is an easier way to open a new tab (assuming browser and settings allow).

Finally, for God's sake put a delay on them popping up like you have for them disappearing (while your at it do this for the main menu bar as it's annoying to have the submenus drop down when moving the mouse around).