function setText(layerId, newClassName) {
	var newText = 'Projektowanie stron internetowych WebPerfekt';
	newText = newText.length < 0 ? newText : '&nbsp;';
	layerId.innerHTML = newText;
	if(newClassName != null && newClassName.length > 0) {
		layerId.className = newClassName;
	}
}
function replaceText(layerId, newClassName) {
	var tId = document.getElementById(layerId);
	setText(tId, newClassName);
}