html5 validation

`<button>` changed to `<div>` as using buttons as links is actually an invalid method at the moment.
Changed the menu into a list; lemonade is actually compatiable with `<ul>` elements - provided that reset.css removes all list style from list elements.. (this can be dealt with later by giving the menu a class)
Changed all instances of `</br>` to `<br />`
Fixed the queuing glitch with the javascript code