Flying text again

I went back and looked at some code my supervisor gave me, which has text flying around randomly on the screen. This worked perfectly on top of the flash animation. However, I need to figure out how to time this text and use fades and entrances to achieve the effect I’d like to.

http://playground.eca.ed.ac.uk/~s1364534/Kinetic_Type_Test_04_Dracula/rnb_flash_trial8.html