// ustawienia

function center() {
	var contentName 	= 'center'; // Element który ma być wyśrodkowany pionowo
	var bodyHeight 		= document.body.offsetHeight;
var bodyWidth		= document.body.offsetWidth;
var content 		= document.getElementById(contentName);
var contentHeight	= content.offsetHeight;
var contentMargin 	= '';
	contentHeight = contentHeight / 2;
	bodyHeight = bodyHeight / 2;
	contentMargin = bodyHeight - contentHeight;
		content.style.top = contentMargin - 31 + 'px';
}

function center2() {
	var contentName 	= 'center2'; // Element który ma być wyśrodkowany pionowo
	var bodyHeight 		= document.body.offsetHeight;
var bodyWidth		= document.body.offsetWidth;
var content 		= document.getElementById(contentName);
var contentHeight	= content.offsetHeight;
var contentMargin 	= '';
	contentHeight = contentHeight / 2;
	bodyHeight = bodyHeight / 2;
	contentMargin = bodyHeight - contentHeight;
		content.style.top = contentMargin + 'px';
}