rollover_images = new Object();

$(document).ready(function() {
  $('.rollover-button').mouseover(function() {
  	$(this).attr('src', rollover_images[$(this).attr('src')].src.replace(/http.*\.com/, ""));
  }).mouseout(function() {
  	$(this).attr('src', $(this).attr('src').replace("-ro.png", ".png"));
  });
});
$(document).ready(function() {
	$('.rollover-button').each(function() {
		rollover_images[$(this).attr('src')] = new Image();
		rollover_images[$(this).attr('src')].src = $(this).attr('src').replace(".png", "-ro.png");
	});
});