download audios in Book

I am making an Application consisting of Book inwhich i have added the Images of each line and i want that when i do focus on particular line the开发者_开发知识库n the respective audio is played, So if i have 7 lines on one page then i have to download 7 audios from server and currently i am using this approach, So Please suggest me because i have to work on entire book and what is the best way to download audios.

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Alternative Approach will be to use a Text to Speech engine like Festival.

IMHO - Downloading each line's audio from the server I think is an Overkill. But that's just me.. :)