Disable pages until they're fully loaded?

 I deal mainly with large scale online applications. Each page that is loaded on a clients computer is littered with JavaSciprt and AJAX functionality.

One problem we've encountered is users clicking buttons before the page is fully loaded. They might load one page, just to find the link to another, and as soon as they can click the link they do.

Some of our older pages in our application were not fixed to load scripts first, and then the content. As well as sometimes a link/button is also dependent on another control that isn't loaded yet.

One thing we've thought of doing was disableing all buttons until the page was fully loaded, however I'm not sure how this will affect our customers, and our testers, will like this though.