function updateButtons(){
	buttons = document.getElementsByClassName('button');
	for(i = 0; i < buttons.length; i++) {
		s = new String(buttons[i].onclick)
		buttons[i].onclick = s.replace("return false;", "self.innerHTML += '<img src=\"/images/ajax-loader-small.gif\"/>'; return false;")
		alert(buttons[i].onclick)
	}
	
Event.observe(window, 'load', updateButtons, false);
}