Where is the cause for the width-overflow?

I've got a problem... I cannot localize the cause for the width-overflow...

Could anyone take a look at it? http://sulayman.org/

I've already been watching out for reasons - but 开发者_StackOverflow中文版didn't find anything.

Thank you all!

div with a class="navigation clear" has a property

margin: 0 0 25px 0;

The 25px is causing this weird behaviour.

There is no width overflow with Firefox 3.6.

If you insist there is, insist back to your browser with a body {width: 100%; overflow: hidden;}