I have inherited a mash of code (image scroller)

So as someone has left where I work, I have got to update one of his jobs.
It’s a set of images that scroll left and right with the mouse and scroll to the left when first loaded, also they enlarge when moused over, oh and they are buttons (this whole ‘idea’ was thought up by the client with a “I want it to do this” statement), and the code is a right mess.
All I have been asked to do is add an extra image, but I have added the image and the whole thing has broke. With some large gaps being added within the images.
Can someone have a look at it and see what’s going on, Alternatively if there is a better solution to get the same result (There has to be this looks like some sort of mash of various bits of other code).
Links: Ziped FLA, [url=http://www.designed4hits.com/temp/banner_scroll_db.swf]SWF & current live [url=http://www.macwet.com/]site (about a third down the page next to “chose your favourite sport”)