Preventing scrolling with fixed headers

I have developed an iphone app using phonehap+JQM1.2.0 that has a fixed header - below the header is scrollable content (so using document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false); is not possible).

I noticed that if you press on the scrollable content and move your finger down, the header moves down too. Can this be prevented? This also happens when there's a footer and I swipe backwards.

Thanks