Add lines of code for 600 html slides.

Hello. I need a few code lines added to 600 html slides. This is a simple copy/paste task, but does require quite a bit of thinking. I have divided it into 3 assignments: 1. Signs. Go through about 100 html files and add jpeg name to it. (so it displays the jpeg image) 2. show/hide elements. Scroll through 500 slides, and add show/hide code line to about 70 of them. 3. Look through 500 slides... then sort them into parent, children and grandchildren and add a few lines of code to make sure they link to each other. This assignment will take a few hours. Please have a look through all 4 word documents before bidding, to make sure you understand the "complexity" of it. (it's not actually difficult once you get started, but does take a while) Thank you all so much for taking your time to read it.