Double image

Double Image showing on Product Details page when click to zoom.
www.keramicke-plocice.net/

all ok?

No, when you in product and click on product image for zoom that have double image.

Ok, i saw, when I view your source I see:

window.addEvent('domready', function() {

SqueezeBox.initialize({});
SqueezeBox.assign($$('a.modal'), {
parse: 'rel'
});
});

twice. That follows some facebook component code. Maybe you need to tune that fb component or turn it off in one place if you have it twice on page.

Problem is in the cashe, after deactivating the joomla cache that work fine. I have not fb component.

Are you know what is the problem with cashing ?

Not sure you need to get rid of one :

SqueezeBox.initialize({});
SqueezeBox.assign($$('a.modal'), {
parse: 'rel'
});
});


go to view source of your page to see that.