// ustawienia
var contentName 	= 'galeriaCont'; // Element który ma być wyśrodkowany pionowo

// zmienne


function center() {
	var bodyHeight 		= document.body.scrollTop;
	var bodyWidth		= window.pageYOffset;
var content 		= document.getElementById(contentName);
var contentHeight	= content.offsetHeight;
var contentMargin 	= '';
	contentHeight = contentHeight / 2;
	bodyHeight = bodyHeight / 2;
	contentMargin = bodyHeight - contentHeight;
	if (contentHeight < bodyHeight ) {
		content.style.top = contentMargin + 'px';
	}
	alert(bodyHeight);
}