Posts page jumps down and around when loading - how do I stop it?

Hello,

When the page with my blog posts is loading the page jumps around and then ends up somewhere near the bottom of the page.

http://tomsimoneweddings.co.uk/wordpress/

It seems to jump to points where there is more info to load, such as pic galleries in posts.

Edit - I'm using iframes to display galleries in posts and currently the page is jumping to them. Not sure if theat is relevant.

Any help appreciated.

Tom