function showImprint(){
	if($('imprint') != null) $('imprint').setStyle('display', 'block');
	if($('overlay_background') != null){
		var ws = window.getSize();
		var wss = window.getScrollSize();
		var wd = (wss.y.toInt() > ws.y.toInt()) ? wss : ws;
		$('overlay_background').setStyle('height', wd.y.toInt());
		$('overlay_background').setStyle('width', wd.x.toInt());
		$('overlay_background').set('opacity', 0.7);
		$('overlay_background').setStyle('display', 'block');
	}
}

function hideImprint(){
	if($('imprint') != null) $('imprint').setStyle('display', 'none');
	if($('overlay_background') != null) $('overlay_background').setStyle('display', 'none');
}