Prototype Clean Up for simple Javascript website

Currently have a website that was written with Javascript - Prototype. Quite small and simple site. Not optimized for IE, Safari or Chrome. Would like for some clean up on the website so the website is viewable in all browsers back to IE8. Currently the home navigation has images that load at the bottom then snap-to in their correct position. On IE8 that same home navigation runs in the background while on the main website content page. Would also like to have the code cleaned up so most elements load properly. Currently the text loads quickly, then loads back up and shifts slightly upwards in IE. Firefox looks fine. Would also like to add another navigation icon at the top which is fairly simple.