function centerMe(itemID) {
	// center the test element on the screen
	sb_windowTools.centerElementOnScreen(document.getElementById(itemID));
	window.onscroll = function() {
		// update the scroll information
		sb_windowTools.updateScrollOffset();
		// update the vertical position of the element
		var element = document.getElementById(itemID);
		element.style.top = ((sb_windowTools.pageDimensions.verticalOffset() + sb_windowTools.pageDimensions.windowHeight() / 2) - (sb_windowTools.scrollBarPadding + element.offsetHeight / 2)) + 'px';
	};
}

function setFGS(){
	sb_windowTools.bottomElementOnScreen(document.getElementById('fgs'));
}

function cancelMe() {
	// reset the test element on the screen
	document.getElementById('test').style.position = '';
	window.onscroll = null;
}